Chapter 1: Introduction to National GHG Inventories

CHAPTER 1

INTRODUCTION TO NATIONAL GHG
INVENTORIES2019 Refinement to the 2006 IPCC Guidelines for National Greenhouse Gas Inventories

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Volume 1: General Guidance and Reporting

Authors
Justin Goodwin (UK), Michael Gillenwater (USA), Daniela Romano (Italy), Klaus Radunsky (Austria)

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Chapter 1: Introduction to National GHG Inventories

Contents
1

Introduction to National GHG Inventories .................................................................................................... 1.5
1.1

Concepts ............................................................................................................................................... 1.5

1.2

Estimation methods .............................................................................................................................. 1.7

1.3

Structure of the Guidelines ................................................................................................................... 1.7

1.4

Inventory quality .................................................................................................................................. 1.7

1.4a National GHG Inventory Arrangements ............................................................................................... 1.7
1.4.1

Institutional Arrangements........................................................................................................... 1.8

1.4.2

Datasets and data flows .............................................................................................................. 1.16

1.5

Compiling an Inventory ...................................................................................................................... 1.18

1.6

GHG inventory management tools ..................................................................................................... 1.18
1.6.1

Workplans .................................................................................................................................. 1.18

1.6.2

Data management system .......................................................................................................... 1.19

1.6.3

Management of QA/QC & documentation material .................................................................. 1.21

1.6.4

GHG inventory training activities .............................................................................................. 1.21

1.6.5

Education, awareness raising and public access to the information ........................................... 1.21

References…………………………………………………………………………………………………. ...... 1.23

TablesTable 1.1 (New)An illustrative example structure for capturing and sharing information on theobjectives of the national GHG inventory .................................................................. 1.10

Table 1.2 (New)

Illustrative table constructed around UK GHG inventory objectives ......................... 1.11

Table 1.3 (New)

List of common actors and stakeholder types with their general roles and capabilities.................................................................................................................................... 1.13

Table 1.4 (New)

Examples of metadata for tracking GHG inventory stakeholders............................... 1.14

Table 1.5 (New)

Illustrative list of datasets used in the GHG inventory ............................................... 1.17

Table 1.6 (New)

Illustrative workplan for the preparation of a GHG inventory including an indicative
timeline ....................................................................................................................... 1.19

Table 1.7 (New)

Suggested information in a standardised data structure for collating GHG inventory
data ............................................................................................................................. 1.20

Table 1.8 (New)

Suggested description of potential, planned and implemented improvements ininventory improvement plan ....................................................................................... 1.21

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FiguresFigure 1.0 (New)

Illustrative example of GHG inventory institutional arrangements structuring .... 1.12

Boxes
Box 1.0a (New)Linkages of GHG inventory activities with other data collection and reporting ..... 1.8

Box 1.0b (New)

Illustrative data flow overview diagram example for South Africa ...................... 1.16

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Chapter 1: Introduction to National GHG Inventories

1

INTRODUCTION TO NATIONAL GHG
INVENTORIES

Users are expected to go to Mapping Tables in Annex 1, before reading this chapter. This is required to correctly
understand both the refinements made and how the elements in this chapter relate to the corresponding chapter
in the 2006 IPCC Guidelines.
No refinement.

1.1

CONCEPTS

Inventories rely on a few key concepts for which there is a common understanding. This helps ensure thatinventories are comparable between countries, do not contain double counting or omissions, and that the timeseries reflect actual changes in emissions.

Anthropogenic emissions and removals
Anthropogenic emissions and removals means that greenhouse gas emissions and removals included in national
inventories are a result of human activities. The distinction between natural and anthropogenic emissions andremovals follows straightforwardly from the data used to quantify human activity. In the Agriculture, Forestry andOther Land Use (AFOLU) Sector, emissions and removals on managed land are taken as a proxy for anthropogenic
emissions and removals (Managed Land Proxy), and inter-annual variations in natural background emissions andremovals, though these can be significant, are assumed to average out over time.
The 2019 Refinement provides in Chapter 2 of Volume 4 an optional approach for estimation and reporting ofanthropogenic greenhouse gas emissions and removals resulting from land use, land-use change and forestry with
the intention to disaggregate the emissions and removals on managed land (i.e., emissions and removals estimatedusing the Managed Land Proxy) into those that are considered to result from human activities and those that areconsidered from natural disturbances (Volume 4, Chapter 2, Section 2.6). Where a country chooses to use thisvoluntary approach, it is good practice to report the total emissions and removals estimated using the Managed
Land Proxy and the two disaggregated components, and to document the methods and assumptions used.
There are additional methods for estimating anthropogenic emissions and removals for flooded land that include
the standard application of the Managed Land Proxy and an optional method to produce indicative estimates ofanthropogenic component of GHG emissions. For details, see Volume 4, Chapter 7 1.
0F

Treatment of CO 2 , CH 4 and N 2 O emissions from combustion of biomass orbiomass-based products
The overall IPCC approach to greenhouse gas emissions from combustion of biomass or biomass-based products(e.g., ethanol) at the national level allows for complete coverage of emissions and removals, and involves all IPCC
sectors, including in particular, Energy, AFOLU, and Waste (see e.g. Volume 2, Chapter 2, Section 2.3.3.4;
Volume 3, Chapter 3, Section 3.11; Volume 4, Chapter 12, Section 12.5; Volume 5, Chapter 5, Section 5.1).
Carbon dioxide (CO2) emissions from the combustion of biomass or biomass-based products are captured within
the CO2 emissions in the AFOLU sector through the estimated changes in carbon stocks, e.g. from biomass harvest,
even in cases where the emissions physically take place in other sectors (e.g., energy). This approach to estimate
and report all CO2 emissions from biomass or biomass-based products in the AFOLU was introduced in the first
IPCC guidelines for national greenhouse gas emissions (IPCC 1995), reflecting close linkages with data on
biomass harvesting, and for the pragmatic reason to avoid double counting.
In AFOLU, CO2 emissions from biomass or biomass-based products used for energy purposes are calculated as
an implicit component of carbon stock changes, e.g. for all forest types and other wood producing land categories,
as part of carbon stock changes in the HWP pool, or when a country chooses to use more advanced (higher tier)methodologies for carbon stock changes in above ground biomass from annual crops. 2 The CO2 emissions frombiomass or biomass-based products used for energy purposes are not included in the sectoral total emissions in
1F

1 In the 2013 Supplement to the 2006 IPCC Guidelines for National Greenhouse Gas Inventories: Wetlands (Wetlands

Supplement), additional methods are applied to the coastal wetlands that do not follow the standard application of theManaged Land Proxy.

2 For annual crops, the IPCC Guidelines assume that biomass carbon stock lost through harvest and mortality equal biomass

carbon stock gained through growth in that same year and so annual crops involve no net CO2 emissions or removals frombiomass carbon stock changes when using Tier 1 methods in the remaining categories of the AFOLU sector (see Section 1.2,
Chapter 1, Volume 1 of the 2006 IPCC Guidelines).

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either the Energy or Waste sectors. This guidance is to avoid the possibility of double counting these emissions in
two or more inventory sectors.
In the Energy sector, CO2, methane (CH4) and nitrous oxide (N2O) emissions from combustion of biomass orbiomass-based products for energy are estimated, but the CO2 emissions are recorded as an information item thatis not included in the sectoral total emissions for the Energy sector. This provides a complete picture of a country’s
energy system and avoids double counting of these emissions with those reported in the AFOLU sector. The CH4
and N2O emissions from the combustion of biomass or biomass-based products for energy are reported andincluded in the sectoral total emissions in Energy sector, as these are not covered by the estimation methods in the
AFOLU sector.
Carbon dioxide emissions from waste incineration or burning under the Waste sector can derive from both, fossil
and biomass materials. When waste is incinerated for energy, the CO2, CH4 and N2O emissions from the biogenic
part of waste are treated in the same way as emissions from other combustion of biomass or biomass-based
products for energy (i.e., CO2 emissions are recorded as an information item in the Energy sector). When waste isburned without energy recovery, CH4 and N2O emissions from the biogenic part of waste are estimated andincluded in the Waste sector, whereas the corresponding CO2 emissions are not reported to avoid double counting
with CO2 emissions reported in the AFOLU sector.

National territory
National inventories include greenhouse gas emissions and removals taking place within national territory andoffshore areas over which the country has jurisdiction. There are some special issues that are described in Section
8.2.1 of Volume 1. For example, emissions from fuel use in road transport are included in the emissions of thecountry where the fuel is sold and not where the vehicle is driven, as fuel sale statistics are widely available andusually much more accurate.

Inventory year and time series
National inventories contain estimates for the calendar year during which the emissions to (or removals from) theatmosphere occur. Where suitable data to follow this principle are missing, emissions/removals may be estimatedusing data from other years applying appropriate methods such as averaging, interpolation and extrapolation. A
sequence of annual greenhouse gas inventory estimates (e.g., each year from 1990 to 2000) is called a time series.
Because of the importance of tracking emissions trends over time, countries should ensure that a time series of
estimates is as consistent as possible.

Inventory reporting
A greenhouse gas inventory includes a set of standard reporting tables covering all relevant gases, categories andyears, and a written report that documents the methodologies and data used to prepare the estimates.
The 2019 Refinement provides standardised reporting tables, but the actual nature and content of the tables andwritten report may vary according to, for example, a country’s obligations as a Party to the United Nations
Framework Convention on Climate Change (UNFCCC). The 2019 Refinement provides worksheets to assist withthe transparent application of the most basic (or Tier 1) estimation methodology.

Greenhouse gases
The greenhouse gases covered in the 2019 Refinement are reported in Chapter 8.

Other gases
The 2019 Refinement also provides information for the reporting of the precursors although methods for estimating
emissions of these gases are not given here. The list of precursors is reported in Chapter 8 of Volume 1.

Sectors and Categories
Greenhouse gas emission and removal estimates are divided into main sectors, which are groupings of related
processes, sources and sinks:• Energy;• Industrial Processes and Product Use (IPPU);• Agriculture, Forestry and Other Land Use (AFOLU);• Waste;• Other (e.g., indirect emissions from nitrogen deposition from non-agriculture sources 3).
2F

3 Estimates include N O emissions from deposition of anthropogenic nitrogen (N) from NO /NH wherever deposited and2x3

from whatever source (but not allocated to specific sectors). The reason for this is that emission factors for nitrogen depositedare of the same magnitude for agricultural sources as for other nitrogen sources, even when the N is deposited in the ocean.

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Chapter 1: Introduction to National GHG Inventories

Each sector comprises individual categories (e.g., transport) and sub-categories (e.g., cars). Ultimately, countries
will construct an inventory from the sub-category level because this is how IPCC methodologies are set out, andtotal emissions calculated by summation. A national total is calculated by summing up emissions and removals
for each gas. An exception is emissions from fuel use in ships and aircraft engaged in international transport which
is not included in national totals, but is reported separately.
In order to calculate a national total it is necessary to choose an approach to include harvested wood products(HWP). Countries can select any of the approaches reflected in Chapter 12 of Volume 4 for the AFOLU Sector to
do this.
Reporting is generally organised according to the sector actually generating emissions or removals. There are some
exceptions to this practice, such as CO2 emissions from biomass combustion for energy, which are reported in
AFOLU Sector as part of net changes in carbon stocks. Where CO2 emissions are captured from industrial
processes or large combustion sources, emissions should be allocated to the sector generating the CO2 unless it
can be shown that the CO2 is stored in properly monitored geological storage sites as set out in Chapter 5 ofVolume 2.

1.2

ESTIMATION METHODSNo refinement.

1.3

STRUCTURE OF THE GUIDELINES

No refinement regarding the structure of the 2006 IPCC Guidelines. Regarding the structure of the 2019
Refinement, see the Overview Chapter.

1.4

INVENTORY QUALITY

No refinement.

1.4A NATIONAL GHG INVENTORY ARRANGEMENTS
This section provides guidance on establishing GHG inventory arrangements that support the sustained updating
and maintenance of high quality and continuously improving national GHG inventories.
It is considered good practice that countries improve the quality (transparency, accuracy, completeness,comparability and consistency (TACCC)) of national GHG inventories on a continuous basis. It is generally
accepted that GHG inventories are useful to users if they are updated on a regular basis. There should be
improvement over time to provide increasingly useful information on national GHG trends (including influencing
factors) and transparent reporting. Establishing sustainable national GHG inventory arrangements will help tocontinuously improve and regularly update national GHG inventories.
Guidance provided in this section should not be considered prescriptive. It suggests possible approaches andexamples of national GHG inventory arrangements demonstrated to be useful when developing sustainable GHG
inventory systems that will improve quality 4, timeliness, and use of resources.
3F

National GHG inventory systems could benefit from being developed in cooperation or integration with otherenvironmental and sustainability statistical data collection services and reporting activities (see Box 1.0a).

4 Transparency, accuracy, completeness, consistency and comparability.

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Volume 1: General Guidance and ReportingBOX 1.0A (New)
LINKAGES OF GHG INVENTORY ACTIVITIES WITH OTHER DATA COLLECTION AND REPORTING

The following linkages can be beneficial and could be managed as a wider programme under GHG
inventory arrangements.
National Statistical Systems provide a wide range of data that can be relevant for the GHG
inventory compilation. These statistical systems collect data on a regular basis and establish
standards for data quality. GHG inventory compilation is a specialised national data collection
activity that requires the collection of additional data that are not typically in national statistics (e.g.
emission factors). GHG inventories should use national statistics where possible. Countries may
integrate their national GHG inventory arrangements, to varying degrees, with their national
statistical systems.
Subnational GHG inventory compilation and facility-reporting (e.g. cities, states, provinces,
territories, and facility emission registries) can bring benefit to and gain from engagement with morestructured and coordinated national GHG inventory arrangements. This benefit can result frominterest in and contribution to combined efforts to gather/collate/use geographically resolved datasuch as for regulated sites (including large industrial installations, waste disposal andrecycling/treatment sites), and diffuse traffic and transport, agriculture and forestry. Use of common
guidelines, approaches and assumptions and pooled resources/expertise between national andsubnational estimation activities will also help to improve the efficiency and credibility of GHG
estimates and decision-making processes associated with them.
National GHG and air pollutant inventories can be compiled in tandem. This cooperation or
integration can improve quality across inventories, as a large proportion of the activity data (energy,
agriculture, transport statistics) are the same for both. It may also improve linkages (throughconsistent use of data) between climate mitigation and air pollution reporting (e.g. to the UNFCCC
and UNECE) and tracking the impact of air pollution and GHG measures to help decision makers
understand the co-benefits and potential conflicts. Countries that apply this integrated or cooperative
approach may pool resources and management systems for both GHGs and air pollutant inventories
and operate more efficiently.
Other environmental and sustainability data gathering processes are undertaken in many
countries. These processes involve the collection, reporting of environmental, and sustainability
data, including GHG emissions and removals, (e.g., in support of indicators for the UN’s Sustainable
Development Goals and national statistical environmental economic accounts). These initiatives
often have a direct links to GHG inventory compilation activities in either using data from the GHG
inventory or providing inputs to its datasets.

1.4.1

Institutional Arrangements

This section introduces the concept of institutional arrangements. There is a wide diversity in approaches used bycountries to monitor, report, verify, and respond to review of its GHG estimates on a regular basis. A sustainable
process for compilation and continuous improvement is an important aspect of institutional arrangements.
Recognising this, this section presents some common concepts and provides some examples of approaches that
could be used when setting up or strengthening sustainable GHG inventory arrangements. Guidance provided inthis section should not be considered prescriptive.
Institutional arrangements include the interactions between organisations that are involved with the GHG
inventory inputs, compilation processes, and outputs. This could include environment, energy, transport,
agricultural, and statistical ministries and/or agencies, academic/research institutions, private organisations andcareer experts and consultants.
Countries may also consider the need for new or modified laws or directives establishing requirements for datacollection, archiving, reporting, and quality management to formalize institutional arrangements for national GHG
inventory compilation in the context of existing national statistical data collection systems.

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1.4.1.1 GHG I NVENTORY O BJECTIVES
A useful concept to help define GHG inventory activities and outputs are a country’s GHG inventory objectives
and other decision-making needs for the GHG data. The identification of objectives will help define the GHG
inventory’s data and expertise needs, roles and responsibilities, scope (e.g. sectors, gases, geographies, time-series
duration), and timeframes (e.g. schedule and updating frequency) for the inventory compilation, reporting, andreview processes. Identifying and assessing objectives also helps the institutions involved in the compilation
understand how/if objectives interact/conflict/mesh with IPCC good practice. An illustrative example of asimplified format that could be used to characterise objectives is presented in Table 1.1. Such a summary table
could complement more detailed descriptions when presenting GHG inventory arrangements. An illustrative
example summary constructed around the United Kingdom’s GHG inventory objectives is presented in Table 1.2.

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TABLE 1.1 (NEW)AN ILLUSTRATIVE EXAMPLE STRUCTURE FOR CAPTURING AND SHARING INFORMATION ON THE OBJECTIVES OF THE NATIONAL GHG INVENTORY
Objective1

Gases2

Sectors &categories3

Geographicalresolution

Temporalresolution of
estimates4

Time series span5

Reportingfrequency6

Reporting formats7

1. List the objectives that the national GHG inventory supports.
2. Add gases included e.g. CO2, CH4, N2O, fluorinated GHGs, other gases such as precursor pollutants.
3. Add sectors included Energy, IPPU, AFOLU, Waste, other sectors.
4. The temporal resolution is usually annual (e.g. 2010, 2011, 2012). Some GHG inventories have different durations spanning several years or sub-yearly (e.g. monthly data).
5. Indicate the start and end date of the time series.
6. How frequently is the data updated?
7. Highlight any specific reporting formats (e.g. table structures, schemas, variables needed for specific reporting).

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TABLE 1.2 (NEW)ILLUSTRATIVE TABLE CONSTRUCTED AROUND UK GHG INVENTORY OBJECTIVES
Objective

Gases

Sectors &categories

UNFCCC: Annual
Reporting[a]National Statistics
Environmental
Accounts[e]EU Monitoring
Mechanism
Regulation[c]UNFCCC: National
Communication

Temporalresolution of
estimates

Timeseries span

Reportingfrequency

Reporting formats
NIR and CRF[f]UK + Overseas
Territories

CO2, CH4, N2O,
Fluorinated gases,
Precursors (SO2, NOx,CO, NMVOC)

Environmental
Accounts[e]AnnualRegulated installations
within mainland UK
Energy, IPPU,
AFOLU, Waste

National Carbon
Budgets[d]UNFCCC: Biennial
ReportGeographicalresolutionUK

NIR and CRF
Annual estimates

Yearly values from1990 until two years
prior to current
calendar year

Carbon Budget
Biennial

CO2, CH4, N2O,
Fluorinated gases

UK + Overseas
Territories

UNFCCC: Nationally
Determined
Contributions[b]CRF: Summary table 2

Every four year
5 Years

CRF: Summary table 2[a] See decision 24/CP.19 on Revision of the UNFCCC reporting guidelines on annual inventories for Parties included in Annex I to the Convention. (Available at: https://unfccc.int/documents/8105).
[b] Article 4(9) of the Paris Agreement: http://unfccc.int/files/essential_background/convention/application/pdf/english_paris_agreement.pdf.
[c] UK reporting commitments to the EU valid from 08/07/2013: Regulation (EU) No 525/2013 of the European Parliament and of the Council of 21 May 2013 on a mechanism for monitoring and reporting greenhouse gas
emissions and for reporting other information at national and Union level relevant to climate change and repealing Decision No 280/2004/EC. (Available at: https://rod.eionet.europa.eu/instruments/652).
[d] https://www.gov.uk/guidance/carbon-budgets.
[e] https://www.ons.gov.uk/economy/environmentalaccounts.
[f] NIR = National Inventory Report, CRF = Common Reporting Format.

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1.4.1.2 S TRUCTURING OF INSTITUTIONAL ARRANGEMENTS
Clarifying the structure of institutional arrangements can help formalise and communicate the functional roles oforganisations in the national inventory compilation process. An illustrative structure provides an overview of theroles and responsibilities whether institutional arrangements are part of a larger statistical data gathering operation
or a stand-alone and dedicated GHG inventory activity. An informative structure diagram could also include
organisation names. An illustrative example structure with optional components is presented in Figure 1.0.
An overview of the roles and responsibilities within institutional arrangements is elaborated in Section 1.4.1.3.
Figure 1.0 (New) Illustrative example of GHG inventory institutional arrangements
structuring 5
4F

There are numerous approaches other than use of a Steering committee that can bring outside input into the GHG
inventory process, such as through a public review period for the GHG inventory.

1.4.1.3

R OLES AND RESPONSIBILITIESThere are many actors and stakeholders involved with and/or interested in GHG inventory inputs, processes, andoutputs. Common actors and stakeholder types are presented in Table 1.3. In some countries, a single
individual/structure may serve in more than one actor role. Understanding the interests, contributions andinvolvement of these actors and stakeholders can help to establish a long-term and well-functioning national GHG
inventory system.

5 The term “Steering Committee” has been used as a generic term to represent a group of interested stakeholders that haveinfluence over the inputs to and development of the GHG inventory.

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TABLE 1.3 (NEW)LIST OF COMMON ACTORS AND STAKEHOLDER TYPES WITH THEIR GENERAL ROLES AND CAPABILITIES
Actor and Stakeholder
Type

Examples of Typical Roles

Necessary Capabilities

Single National Entity(SNE) /National Focal
Point (NFP) (see 1.4.1.4)

Acquisition and allocation of
resources.
Development of long-term strategy for
GHG inventory support to national
decision makers, climate action andreporting.
Arranging contracts and agreementswith collaborating entities that
contribute data, research studies,
estimate emissions or provide expert
reviews, etc.
Responsible for submission of GHG
inventory.

Technical and administrative expertise, as
well as formal government authority.
Understanding of reporting requirements and
IPCC good practice concepts.
Capacity to coordinate and lead the process.
Authority to engage other government
departments and non-governmentorganisations.

A group or management
structure that contributes
to steering the GHG
inventory development
and who is interested in
its outputs and key
messages on trends in
GHGs (e.g. Steeringcommittee, see 1.4.1.5)

Provide input to the planning,
coordination, management andtechnical facilitation of inputs andoutputs in the process, advisors to the
National Focal Point.
Advice on choice of methods withregard to data availability anddecision-making needs.

Sectoral, dataset and/or government policy
involvement, knowledge, and authority overdata collection, research and national
strategies.
Involved with policy and decision making andnegotiations (e.g. on target setting andmitigation implementation) that uses national
GHG inventory data.

Inventory
manager/coordinator (see1.4.1.6)

Management of contracts and delivery
of workplans.
Coordination with all actors andstakeholders.
Management of experts.
Management of data supply and data
supply agreements.
Identification of resources necessary to
improve data flows.
Coordination of reviews and responses
to independent review/analysis andtracking of recommendations.
Technical reporting of GHG inventory
data and formal submission of reports.

Project management & team management.
Quality assurance/ Quality control (QA/QC)(see Section 1.6.3).
Technical knowledge of the reporting
requirements, review processes and IPCC
methodologies.
Technical awareness of tools, processes, andIT systems for gathering and reviewing data.

Compilation (sector)
experts and researchers(see 1.4.1.7)

Overall development of methods, data
sources, data gathering, compilationand document management.
Identify and propose ways to resolve
cross cutting issues.
Undertake research, data collection,
calculations, drafting, quality control,archiving, and documentation.
Coordinate with other sector experts.
Specialist in a sector, category orgroup of categories.
Identification of potential
improvements to estimates.

Technical knowledge of the reporting
requirements and IPCC methodologies.
Technical skills to carry out the work required
for the GHG inventory calculation (dataanalysis, QA/QC, calculations,documentation).
Familiarity with national statistics.
Specific national sectoral or sub-sectoral
knowledge of practices and technologies
employed, data sources, trade associations,networks, policies and key assumptions.

•
•
•
•

Energy
IPPU
AFOLU
Waste

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TABLE 1.3 (NEW) (CONTINUED)
LIST OF COMMON ACTORS AND STAKEHOLDER TYPES WITH THEIR GENERAL ROLES AND CAPABILITIES
Actor and Stakeholder
Type

Examples of Typical Roles

Necessary Capabilities

Data providers (see1.4.1.8)

Timely delivery of input data inappropriate format.
Management of data acquisition,
processing and reporting systems,
QA/QC requirements.
Communication with SNE, theInventory Agency and sector experts,
as needed.

Technical skills/knowledge of, legal authority
to improve and enhance data collection.
Understanding of the datasets provided.

Other contributors andusers

General interest in the work with
provision of expertise, independent
review, research or use of the data forother purposes.

Any

Policy analyst

GHG inventory data users that inform
policies and feed into climate action
analysis.

Any

Each actor/stakeholder contributing to the national GHG inventory may need some form of terms of reference(ToR) to facilitate their engagement. Such a ToR can specify functional roles and responsibilities (e.g., inventory
compilation, expert input, tool development and use, and/or data collection and storage) and the schedule for
conducting this work. Existing terms of reference for duties such as environmental data gathering or industrial
reporting may also be revised to address GHG inventory responsibilities.
The process of engaging actors and stakeholders is likely to vary between different countries and between sectors
within countries. The development and maintenance of lists of actors and stakeholders, their roles, responsibilities
and interests are quite common. Table 1.4 provides examples of metadata for listing actors and stakeholders
involved in the GHG inventory process.
TABLE 1.4 (NEW)EXAMPLES OF METADATA FOR TRACKING GHG INVENTORY STAKEHOLDERS
1.Name2.Organisation

3.Contact

4.Mandate

5.Engagement
Activities

6.Sector

7.Role1. Name: stakeholders name.
2. Organisation: organisation affiliation.
3. Contact: contact details.
4. Mandate: mandate/terms of reference to contribute to the GHG inventory (if any).
5. Engagement activities (Activities that the stakeholder has been regularly involved with e.g. training, workshops, regular meetings
attended, data provision etc.).
6. Sector: sectors/categories involved with (any particular sector or category involvement).
7. Role: type of involvement (e.g. as a data provider, data user, compilation expert, coordinators, data gathering, QA/QC, review, steeringcommittee meetings, training, sectoral workshops, compilation and reporting activities, consultations, and reviews.

1.4.1.4 T HE S INGLE N ATIONAL E NTITY
The term “single national entity” (SNE) is often used to refer to the lead organisation with the responsibility forreporting official national GHG estimates. It is often aligned with the national focal point or international point ofcontact on climate reporting. The role of SNE is usually taken on by a government ministry with mandate to
manage the country’s GHG inventory reporting and response to climate change or may be with a national statisticalor environmental agency. A key role within the SNE is that of overseeing the GHG inventory activities. A
designated focal point coordinates the activities needed to ensure that outputs are prepared of sufficient quality tomeet the country’s commitments. The role of SNE is sometimes delegated by a government ministry, via
mandates/terms of reference, to a climate change, environmental, or statistical agency with the technical capacity

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to prepare national reports. The SNE could be the Inventory Agency with a mandate to report the GHG inventory
data to the ministry or on behalf of the ministry internationally.

1.4.1.5 N ATIONAL GHG I NVENTORY T ECHNICAL S TEERINGC OMMITTEE OR WORKING GROUPCountries may find it useful to establish a working group or committee of interested actors and stakeholders toparticipate in national processes for approving GHG inventory developments and estimates.
This group or committee can consist of actors and stakeholders representing users of (e.g. policy makers) and data
providers to the national GHG inventory (e.g. research agencies, national statistical organisations, environment
agencies, academic institutions, industrial trade associations, and consultancies). It can provide a forum for the
SNE to coordinate and communicate on GHG inventory activities and to secure data provision and independent
analysis.
This group of stakeholders can be also convened in support of prioritisation and implementation of inventory
improvements.

1.4.1.6 I NVENTORY M ANAGER /C OORDINATOR
Types of institutions that could serve as inventory manager/coordinator include:• A government ministry. Inventory management and coordination can be implemented by a government
ministry that also serves as the SNE, in which case it should have the appropriate coordination and technicalcapacity.
• A national institution/agency. Inventory management and coordination can be delegated to a competentinstitution (e.g. statistical, meteorological, or environmental). Such an institution is typically focused onproviding technical support and analysis to government officials for decision making and reporting. It willoften have expertise on certain sectors and access to some of the datasets needed for the compilation and willthen outsource other data gathering and compilation for other sectors (e.g. Forestry and Other Land Use toforest agencies or institutions).
• A private company, university or other non-government organisation. The inventory management andcoordination can be contractually delegated to an organisation outside of government, such as a university,
research institute, or a consultancy/private company. This organisation may be selected for its technicalcompetency and capacity to coordinate the activities and expertise for the compilation and reporting of theinventory. Contracts can be typically set-up with well-defined deliverables and quality objectives 6 andcommitments to engage the organisation preferably over a suitable period (e.g. 4 to 6 years) to promote thesustained development and maintenance of the GHG inventory. Whether the inventory is managed within thenational government or by external organisations, provisions could be in place for the transfer of data,
documents, calculation and reporting tools and knowledge of the national GHG inventory to a new inventory
manager/coordinator (e.g., from SNE to a new contracted organisation such as a private company), including
consideration of adequate training investment. These provisions can help ensure national retention of
institutional knowledge and capability to ensure that the inventory can continue to be delivered and achieve
quality standards in the future.
5F

1.4.1.7 C OMPILATION EXPERTS
A national GHG inventory system can benefit from a committed team of inventory compilation experts. Theseexperts understand the requirements for inventory quality (as defined in Chapter 1, Section 1.4 of the 2006 IPCC
Guidelines), IPCC methods, national emission/removal related sectoral processes/practices, and national datasets.
It is advantageous for experts to have a good understanding of international reporting and review processes, which
can be developed through participation in international or regional peer review activities.
As an example, roles and responsibilities for core compilation functions of the GHG inventory team are also
outlined in a comprehensive templates prepared by the US EPA in the Greenhouse Gas Inventory Toolkit (EPA
2016). These are not the only examples, but they provide a useful starting point for specifying terms of reference.

6 Linked to the quality principles (TCCCA referred to in Volume 1).

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1.4.1.8 D ATA PROVIDERS
Chapter 2 provides detailed identification of relevant data providers and sources of data. National statisticalagencies often have a central role in a country's statistical data collection. Further examples for the formalisationof agreements with data suppliers are provided in Section 1.4.2.2.

1.4.2

Datasets and data flows

There are numerous datasets needed for GHG inventory compilation and many data providers (including national
statistical agencies, research institutes, government ministries, etc.) who provide them. Approaches for datacollection are provided in Chapter 2. Mapping the “flow” of data, in the form of a diagram, from initial datacollection to final reporting, further documents and highlights importance of data providers for the inventory
compilation process. An illustrative example of such a diagram is provided in Box 1.0b.
BOX 1.0B (NEW)ILLUSTRATIVE DATA FLOW OVERVIEW DIAGRAM EXAMPLE FOR SOUTH AFRICA

The diagram below presents a simplified view of the key data flows for South Africa’s GHG
inventory. This data flow diagram is underpinned by a list of datasets used in the GHG inventory
which links to the relevant data providers held in a related list in South Africa’s National System for
GHG Estimation and Reporting 7.
6F

The diagram illustrates the data flows from industrial reporting, government departments and otherdata sources for South Africa. Industrial reported data are made available to the GHG inventory via
the National Atmospheric Emissions Inventory Systems (NAEIS). Reporting industries aremandated to report certain GHG relevant information into the NAEIS by the GHG Regulation thatwas established in 2016-2017. A number of government departments provide statistical data such as
the energy balance, mineral resources and traffic statistics. Other organisations provide data such asthat used for country-specific emission factors derivation, certain agriculture and forestry statistics.
More detailed data flows for specific datasets, sectors, or categories can help document the process, improvetransparency and build institutional memory.

7 Own construction based on the South Africa’s 2nd Biennial Update Report. (Available at:https://unfccc.int/documents/39835).

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Chapter 1: Introduction to National GHG Inventories

1.4.2.1 A RCHIVE OF DATASETSAn important component of institutional arrangements is a systematic approach to data management and thecollection of data. A first step could be to create and maintain an archive and list of the datasets that are needed
for the GHG inventory compilation. This archive and list, which can be established for each sector or as acentralised entity, can help to build and maintain institutional memory and support efficient and transparent
compilation of regular updates. An illustrative outline for a list of datasets is presented in Table 1.5.
TABLE 1.5 (NEW)ILLUSTRATIVE LIST OF DATASETS USED IN THE GHG INVENTORY
1.Name2.Status

3.Description

4.Reference

5.Location

6.Data Provider

7.Sector/
category

8.Update

1. Name: This should be a unique name for the dataset.
2. Status: Provide a status to indicate if the dataset is received or pending receipt, outdated etc.
3. Description: A description of the dataset, including version and date.
4. Reference: A reference or link to a relevant data supply agreement if it exists (see Section 1.4.2.2).
5. Location: Where the received data are stored within the GHG Inventory archive.
6. Data Provider: The provider of the data.
7. Sector/category: The sectors/categories of relevance to the dataset.
8. Update: The regularity that the dataset is updated.

1.4.2.2 D ATA SUPPLY AGREEMENTS (DSA S )Chapter 2 on data collection refers to the establishment of agreements formalising data supply. A data supply
agreement (DSA) is a document that defines what data, from whom, to whom, and when it will be supplied for
GHG inventory compilation. Ideally, a DSA is arranged between the GHG inventory SNE and the data supplier.
A DSA can be beneficial for both an SNE/inventory compiler and data supplier. A DSA can help secure data
provision in the future. Also, a DSA can assist a data supplying organisations by establishing a formally recognizedacknowledgement that can promote the allocation resources within the data supplying organisation to deliver highquality data on time.
There are many potential DSA formats. Where there are national laws for data supply, these can be referenced.
Where data supply is less formal, DSAs act as an informal specification. Suitable examples of DSAs can be foundin many of the countries that are Annex I Parties to the UNFCCC. Possible contents, taken from examples of
DSAs, 8 that could form part of an agreement document between the GHG Inventory SNE and the data supplier
stakeholder are suggested below:
7F• background on the needs/mandate for the GHG inventory compilation;• reference to laws/terms of reference and co-operation between the data supplier and the GHG inventory
representatives;• objectives of the agreement with reference to an annex specifying the details;• confidentiality provisions and commitments;• procedures that enable the receiving party (the data user, e.g., SNE or inventory agency) to provide feedback
to the data supplier on priorities for future improvement of the data set;
• signatures of GHG inventory representative and data supplier, if appropriate;• technical annex containing details of the data to be supplied, including:(i)unique title of the dataset (to avoid confusion with other datasets);(ii)

confidentiality flags;

8 There are many countries (e.g., United Kingdom, Austria and South Africa) that are working with and developing DSAs.

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description including format (electronic format) and scope (time-series, detail, nomenclature,categories, geographies);(iv)

supplying department/service;(v)

deadlines for supply;(vi)

details of QA/QC applied to the data prior to supply;(vii)

uncertainties in the data.

A generic template for the development of a DSA in the form of a memorandum of understanding with a data
supplier can be found in the National Greenhouse Gas Inventory Templates developed by the United States
Environmental Protection Agency and United States Agency for International Development hosted by the LEDs
group (EPA 2016).

1.5

COMPILING AN INVENTORY

No refinement.

1.6

GHG INVENTORY MANAGEMENT TOOLSThe development of GHG inventory management tools will help to ensure efficiency and transparency in the GHG
inventory compilation activities throughout the steps identified in the compilation cycle in Figure 1.1 of Section
1.5 of the 2006 IPCC Guidelines. Tools include workplans, improvement plans, data management systems, quality
systems, training and capacity building and documentation procedures.
The tools in this section should not be considered prescriptive. The sections below provide some suggested
approaches and examples demonstrated to be useful when developing sustainable GHG inventory systems thatwill improve quality 9, timeliness, and use of resources.
8F

1.6.1

Workplans

National GHG inventories compiled/updated on a regular basis can benefit from the development of a clearly
defined workplan, which clarifies the schedule of steps for generating GHG inventory outputs. An illustrative
example workplan for a regular inventory update cycle is presented in Table 1.6. Workplans should be reviewed,
and where necessary, revised prior to the start of a new inventory update cycle. The GHG inventory
manager/coordinator should maintain these workplans and formalize them with GHG inventory compilation
contributors through communication of the workplan.

9 Transparency, accuracy, completeness, consistency and comparability.

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TABLE 1.6 (NEW)ILLUSTRATIVE WORKPLAN FOR THE PREPARATION OF A GHG INVENTORY INCLUDING AN INDICATIVE TIMELINE
Illustrative
Milestones 10

Illustrative lead
actor/stakeholder

Agreement on the scope of work (including stakeholder
consultation and identified improvements and updates to thetime-series) and timeframes with stakeholders/steeringcommittee

Week 1

SNE/Inventory
manager/coordinator & steeringcommittee engaged forprioritising improvements

Appointing/engaging the team of experts to deliver the scopeof work needed (data collection, compilation, QA/QC,
documentation and reporting) establishing/revising Terms ofReference:

Week 2-6

Example Activity

9F

•
•
•
•

Sectoral estimation (e.g. Energy, IPPU, Agriculture, FOLU
and Waste), including:
•
•
•
•
•
•
•

SNE/Inventory
manager/coordinator

Roles and responsibilities
Timelines
Deliverables
Time (budgets) allocation
Week 3-30

Collecting data (engaging with data suppliers) and checking
data supplied
Agreeing any new methodologies and/or continuation ofexisting methodologies
Calculation of estimates
QC (checking of all estimates)
QA (peer review of new estimates)
Documentation
Finalisation of reporting formats

Compilation experts

Collation of sectoral estimates into draft final datasets andnational totals and trends (master summary files or database);compilation of uncertainty and key category analysis

Week 30-34

QC of draft final estimates and documentation of changes andtrendsWeek 32-36

Drafting (collation of the sectoral documentation on methods,
data sources and assumptions, key category and uncertainty
analysis) into the National Inventory Report

Week 34-40

Consultation with stakeholders on draft final estimates andNational Inventory Report and documented changes and trend
featuresWeek 40-46

Finalisation of estimates and the National Inventory Reportand archiving of the GHG inventory material

Week 46-50

Reporting and other deliverables to stakeholders and national
decision-making processes

Week 50-52

Inventory manager/coordinator.
Compilation experts where
needed for follow-up(SNE and steering committee
engaged for stakeholder
review/consultation on outputs)

Table 1.6 is only illustrative. It may require adjustment to the specific national circumstances including thetimeframes and time period of the GHG inventory cycle which may be more than 1 year (e.g., 2 or 4 years).

1.6.2

Data management system

The process of preparing and updating a national GHG inventory will involve the use of numerous datasets,
documents, references, as well as the application of a range of assumptions, expert judgements, data conversions,and manipulations (e.g., combining data from multiple data sources). Volume 1, Chapter 2 provides guidance on
documentation for data collection and Volume 1, Chapter 6 provides additional guidance on documentation.

10 Milestones should be specified as specific calendar dates.

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There are many different data management systems used by countries. Some use sophisticated database tools
connected to the internet and available for users to upload data and to operate from remote locations. However,many countries currently operate using a collection of spreadsheets, databases and bespoke software systems forcalculating GHG estimates. Some key points around the differences between data management systems needed
for calculating estimates and for aggregating and reporting GHG inventory data are provided below:
Calculating GHG Estimates: Sector compilation experts need flexibility to compile estimates using tools
appropriate to national circumstances, including the complexity of their data and methods. Specialised models or
spreadsheets may be appropriate. Spreadsheets are often used when starting out and for developing methods, as
they are accessible to a range of experts. More complex methods will often entail use of specialised models or
databases to facilitate complex calculations and/or the handling of large datasets. Whatever tools are used, applying
a common practice for documentation within calculation tools including the following points should be considered:
1. using standard classification and nomenclatures for compilation of estimates (this nomenclature can be basedon country-specific or IPCC or other recognised classifications (e.g. United Nations Statistics Division (UNSD)
classifications 11);
10F

2. including metadata in each file and maintaining a master list of the calculation files, their types, authors, andversions;
3. using a standard file naming convention across categories and inventory cycles;
4. documentation in tools with evidence of the implementation of QA/QC procedures;
5. colour coding or other visual formatting to differentiate between areas of data input, calculations, QA/QC
checks, explanations, and outputs;
6. documenting where historical data or methods have been revised;
7. documentation of complex models (see Volume 1, Chapter 6); and8. standard output format for all reported data.
Collation, Aggregation and Reporting: For analysis and reporting, inventory data needs to be collated, fromwhat can be in the form of differently formatted spreadsheets or calculation models, into a coherent set of tables
that can be aggregated to produce detailed reporting formats, national totals, and summary tables. This collationof data into a single format also enables general QA/QC to be applied more easily using tools that can identify
anomalies in trends and missing data points. A suggested standardised structure for collating data within a databaseon emissions, removals, and relevant activity data from the range of categories, gases, fuels and other subcategories is presented in Table 1.7.
TABLE 1.7 (NEW)SUGGESTED INFORMATION IN A STANDARDISED DATA STRUCTURE FOR COLLATING GHG INVENTORY DATA
1.Year

2.National
Nomenclature

3.Reporting
Nomenclature

4.Geography

5.Gas

6.Type ofvariable

7.Value

8.Units

9.Notation
Keys

10.Reference

1. Year (the year of the value in the time-series).
2. National nomenclature (if relevant the nomenclature used nationally and linked to the statistics, national definitions and/or source data,
allowing reports for national use in a nomenclature familiar to national actors and stakeholders).
3. Reporting nomenclature (e.g. IPCC categories and fuels/activities).
4. Geography (identifying which part of the national geographical area is represented).
5. Gas/pollutant.
6. Type of variable (e.g. emission/removal, activity data, implied emission factor).
7. The variable value.
8. Variable units.
9. Notation key (if relevant).
10. Reference/description of updates since previous compilation; and reference for the source of the value (calculation file).

11 https://unstats.un.org/unsd/classifications/.

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1.6.3

Management of QA/QC & documentation material

Extensive guidance on QA/QC and documentation is presented in Volume 1, Chapter 6. The following components
could be considered as part of QA/QC management and documentation of the GHG inventory:• QA/QC Plan (see Section 6.5 of the QA/QC chapter of the 2006 IPCC Guidelines), including general andcategory-specific QC procedures (see Sections 6.6 and 6.7).
• A log of implemented QA/QC and verification activities with reference to associated documentation andfindings (see Sections 6.8 and 6.10 of the QA/QC chapter).
• An inventory improvement plan containing potential, planned and implemented improvements. This plan
may include a simple table as illustrated in Table 1.8:
TABLE 1.8 (NEW)SUGGESTED DESCRIPTION OF POTENTIAL, PLANNED AND IMPLEMENTED IMPROVEMENTS IN INVENTORY IMPROVEMENT
PLAN

1.Categorisation

2.Name3.Description

4.Origin

5.Status

6.Priority

7.Owner

1. The categorization of the improvement. This could include the sector or categories, and the type of improvement activity (e.g.
improved QA/QC processes, improved uncertainties or key category analysis, improving activity data, moving to higher tier methods).
2. A short unique name.
3. Improvement description including information on timeframes and technicalities for development.
4. The origin of the improvement (e.g. recommendation or expert suggestion or international review process).
5. The status (e.g. suggested, proposed, planned, work in progress, implemented) of the improvement.
6. The priority of the improvement (informed by the key category analysis).
7. The owner is the person or entity responsible for implementing the improvement.

• An inventory archive (see Section 6.11 of the QA/QC chapter) that structures and stores data on the latest andprevious GHG inventory estimates, reports, methodology documents, and calculation files.
• Country-specific training material addressing country-specific methods and data management tools.

1.6.4

GHG inventory training activities

Suitably trained and/or experienced GHG inventory experts help support the national GHG inventory system toefficiently produce high quality outputs. Training and experience development can be focussed in three areas:• Training in the methods in the latest IPCC Guidelines available from a number of training services and the
UNFCCC/IPCC.
• Training in the application of relevant IPCC Guidelines to the country circumstances. This training may include
country-specific or international courses and material.
• Participation in international review processes (e.g. UNFCCC process), which can provide experts with broader
experience with GHG inventories undertaken by other countries.
Ready access to training and regular review participation can help build national capacity, understanding ofinternational reporting requirements, and enhance sustainability of the national GHG inventory arrangements. It
may be helpful for the Single National Entity to maintain a roster of identified trainers and archive of training
material.

1.6.5

Education, awareness raising and public access to theinformation

A national GHG inventory can provide information (e.g. increasing or decreasing trends and sectoral contributions)to support stakeholder decision making. Education-related activities aimed at stakeholders (e.g. relevant
government ministries) can help develop their technical capacity, enhance cooperation, and improve theirknowledge that can in turn contribute to the continuous improvement of the GHG inventory.

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There are activities that can be useful in promoting the GHG inventory processes and outputs. Some examples ofsuch activities include:• Organizing GHG inventory orientated workshops with stakeholders. These can range from technicalworkshops focused on overall inventory results or on specific sectors to awareness raising events for mass
media.
• Publication of the GHG inventory data in user-friendly forms using visual tools such as infographics toengage with wider stakeholders, students, the press and policy makers.
• Development of overview and sector specific indicators and factsheets highlighting key stories on the trends
and progress to targets.

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References
References copied from the 2006 IPCC Guidelines
IPCC (1997). Revised 1996 IPCC Guidelines for National Greenhouse Gas Inventories: Volumes 1, 2 and 3.
Houghton, J.T., Meira Filho, L.G., Lim, B., Tréanton, K., Mamaty, I., Bonduki, Y., Griggs, D.J. and Callander,
B.A. (Eds). Intergovernmental Panel on Climate Change (IPCC), IPCC/OECD/IEA, Paris, France.
IPCC (2000). Good Practice Guidance and Uncertainty Management in National Greenhouse Gas Inventories.
Penman, J., Kruger, D., Galbally, I., Hiraishi, T., Nyenzi, B., Enmanuel, S., Buendia, L., Hoppaus, R.,
Martinsen, T., Meijer, J., Miwa, K. and Tanabe, K. (Eds). Intergovernmental Panel on Climate Change (IPCC),
IPCC/OECD/IEA/IGES, Hayama, Japan.
IPCC (2003). Good Practice Guidance for Land Use, land-Use Change and Forestry. Penman, J., Gytarsky, M.,
Hiraishi, T., Kruger, D., Pipatti, R., Buendia, L., Miwa, K., Ngara, T., Tanabe, K. and Wagner, F. (Eds).
Intergovernmental Panel on Climate Change (IPCC), IPCC/IGES, Hayama, Japan.

References newly cited in the 2019 Refinement
EPA (2016). National Greenhouse Gas Inventory Toolkit, USEPA & USAID (available at:
http://ledsgp.org/resource/greenhouse-gas-inventory-system/?loclang=en_gb#ghg-toolkit).
IPCC (1995). 1994 IPCC Guidelines for National Greenhouse Gas Inventories: Volumes 1, 2 and 3. Houghton,
J.T., Meira Filho, L.G., Lim, B., Tréanton, K., Mamaty, I., Bonduki, Y., Griggs, D.J. and Callander, B.A. (Eds).
Intergovernmental Panel on Climate Change (IPCC), IPCC/OECD/IEA, Paris, France.
IPCC (2014). 2013 Supplement to the 2006 IPCC Guidelines for National Greenhouse Gas Inventories: Wetlands,
Hiraishi, T., Krug, T., Tanabe, K., Srivastava N., Baasansuren, J., Fukuda, M. and Troxler, T.G. (eds).
Published: IPCC, Switzerland.

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