DOI: 10.5281/zenodo.14712269
title: Region constrained terrestrial areas of conservation importance for 2030

description: This data repository contains updated layers of global terrestrial conservation importance based on the framework and feature data described in Jung et al. (2021). The purpose of these updated maps is to more closely support modelling efforts in global intercomparison exercises (e.g. Bending the Curve) as well as to align with Target 3 ("30x30") of the Kunming-Montreal Global Biodiversity Framework (source).Compared to the previous results published in Jung et al. (2021), a few updates have been made:



The protected area dataset was updated to a WDPA snapshot collated in late November 2024.

No hierachical rankings, instead only the solution for 30% global land "budget" are provided.

Additional variants (see accompanying variant file) related to national responsibility and a more globally just distribution are provided.



Specifically two variants that constrain the maximum allocation of land to 30% per country or 30% of terrestrial biome



The global spatial-explicit database on Other Effective Conservation Areas (OECM) is considered in some variants so as to nudge (if there are sufficient benefits) areas of conservation importance towards those places where such management occurs.


Data properties:




Format
Gridded geoTiff


Spatial grain
10 x 10 km² and 50 x 50 km²


Units
Fractions of grid [0-1] x 10000


Geographic projection
World Mollweide (https://epsg.io/54009)


Reference period
2024 (WDPA)


Spatial extent
Global (excluding Antarctica)


Number of variants / prioritization scenarios 
18, See accompanying inventory.xlsx file. 




Additionally, a reporting protocol following the ODPSCP standard version 0.4 (see Jung et al.) is provided as overview and to allow relative comparisons with other prioritizations.

Cautionary notes for interpretation:



This analysis reveals areas of conservation importance, defined as those areas which would benefit from increased conservation actions (through whatever measure). They are not prescriptive with regards to the type and governance of conservation (e.g. protected areas) for any given area.

This work builds primarily on the processed feature data (biodiversity and carbon) used in Jung et al. (2021). Since then several updates to IUCN range data have been made, which however are not considered in this work.

Habitat changes since the production of the feature data, for example owing to land-use changes such as deforestation, were not considered or incorporated.

Biodiversity data originates primarily from expert-based range maps, which can be prone to omission and comission errors.

Although care was undertaken to geographically project and rasterize the protected area dataset to a gridded resolution, it is possible that not every protected area is captured in whole. 

There are known issues with publicly available WDPA data not being available for several countries including China (see protectedplanet.net and Bingham et al. 2019). Region-constrains added for those countries in particular thus likely result in more ambitious areas than what already is under conservation management.

Several countries (but by far not all) have already made detailed commitments as part of National Biodiversity Strategies and Action Plans (NBSAPs) on which type and how much area they plan to conserve. These were however not taken into account for this work.


Disclaimer: Any borders of countries used here as constraint do not necessarily represent the view of IIASA or it's National Member Organizations. All layers are provided as is and the authors takes no responsibility for errors or misuse and misinterpretation. References:

Jung, M., Arnell, A., de Lamo, X. et al. Areas of global importance for conserving terrestrial biodiversity, carbon and water. Nat Ecol Evol 5, 1499–1509 (2021). https://doi.org/10.1038/s41559-021-01528-7Jung, M., Arnell, A., De Lamo, X., García-Rangelm, S., Lewis, M., Mark, J., Merow, C., Miles, L., Ondo, I., Pironon, S., Ravilious, C., Rivers, M., Schepashenko, D., Tallowin, O., van Soesbergen, A., Govaerts, R., Boyle, B. L., Enquist, B. J., Feng, X., … Visconti, P. (2021). Areas of global importance for conserving terrestrial biodiversity, carbon, and water (1.0) [Data set]. Zenodo. https://doi.org/10.5281/zenodo.5006332