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Household Survey on Air Conditioner Use andEnergy Consumption in Vietnam
Aya YOSHIDA1*, Tran Ngoc HOANG2 and Tomohiro TASAKI1
1

Material Cycles Divisions, National Institute for Environmental Studies,
16-2 Onogawa, Tsukuba-shi, Ibaraki 305-8506, Japan
2
The Hanoi SWM Study Specialist Team,
No.65 Quan Su Street, Hoan Kiem District, Hanoi City, Vietnam*E-mail: ayoshida@nies.go.jp

Abstract
Demand for electricity is rapidly increasing in Vietnam due to increased use of air conditioners (ACs) andother electrical appliances. Therefore, effective measures are needed for reducing Vietnamese electricity
consumption to reduce potential future demand. In 2016, we conducted a survey of 30 households in urban andrural areas of Hanoi and Long An in northern and southern Vietnam, respectively, to examine differences inelectricity consumption and the use of ACs and other electrical appliances between different locations andsocioeconomic classes. We found that ACs were mainly used in the summer (May–October in Hanoi;
March–August in Long An). Households with higher incomes tended to use ACs for most or all of the year.
Many households tended to use ACs while sleeping. Younger respondents tended to use ACs for a longer periodof time compared with their parents. Respondents in Long An seemed less dependent on ACs compared withthose in Hanoi because of regional characteristics and their custom of cold-water bathing. Although increased
income is a major factor underlying the use of ACs, other factors such as the structure of modern housing,health awareness, the inability to open windows and local customs were also found. Together, the present
results suggest that both hard-type (e.g., improving the thermal performance of residential buildings) andsoft-type (e.g., publication of basic tips for energy-saving AC use) policy approaches will be important for
reducing future energy consumption in Vietnam.
Key words: air conditioning, consumer behavior, lifestyle, sustainable consumption

1. Introduction
In 1986, the government of Vietnam initiated a set of
economic reforms (collectively referred to as the Đổi Mới
Policy) with the aim of transitioning the Vietnamese
economy to a socialist-oriented market economy. The
success of these reforms meant that in only 20 years
Vietnam went from being one of the poorest countries in
the world with a per capita GDP of about 200 USD in1990 to being a middle-income country with a per capita
GDP that exceeded 1000 USD in 2008. During this period,
the Vietnamese economy grew at an average annual
economic growth rate of 7%, second only to that of China.
While this rapid economic growth has brought aboutmaterial affluence, various social problems have also
emerged. For example, social inequality has increased,with the gaps between the rich and poor, and urban andrural areas becoming increasingly apparent (Taylor, 2004).
Along with this economic growth, a new urban, educatedGlobal Environmental Research
25/2021: 075–084
printed in Japan

middle class has formed (Nguyen-Marshall et al., 2012).
This new middle class, made up of people generally intheir 30s with a college degree work at companies withforeign affiliations, are relatively free from oldperspectives, have rational values and drive
mass-consumption trends in the country (King et al.,2008). The parents of this new middle class, the so-called
Bao Cấp generation, had a tough time during theiradolescence in the “subsidy period” before the Đổi Mới(1975–1986) (Teekantikun, 2014) and some wereeducated in the former Soviet Union or in Eastern
European countries. The grandparents of this new middle
class were born before the country achieved independence,experienced extreme poverty under a protracted period ofwar (First Indochina War, 1946–1954; and Second
Indochina War, 1965–1975); and were middle-aged as thecountry transitioned to a socialist state. This
intergenerational gap, together with the current
socioeconomic disparities, greatly divided society because,2021 AIRIES76

A. YOSHIDA et al.

in a sense, the social wisdom of the ancestors hardly
worked.
Due to its high economic growth, Vietnam’s final
energy demand increased by an average of 4.1% annually
between 2006 and 2015, and if this trend continues,
Vietnam’s final energy demand is projected to grow by
2.5 times between 2015 and 2035 (Danish Energy Agency,2017). According to a 2016 Vietnamese household living
standard survey, ownership rates of major household
appliances were 92% for a color television, 69% for arefrigerator, 35% for a washing machine, 27% for a water
heater and 19% for an air conditioner (AC) (GSO ofVietnam, 2018). Compared to the ownership level of 2006,
AC ownership increased by a factor of six, whereas thoseof other electric appliances increased by factors ranging
from one to four. If this proliferation continues, energy
demand in the country will further increase, leading togreater impacts on the global environment (Sahakian,2014). Therefore, it is important to find a way to reduce
the energy used for ACs and other household electric
appliances.
Many studies have been conducted on the indoor
thermal environment of houses in Southeast Asia, mainlyin the field of building environmental engineering(Kubota et al., 2011; Uno et al., 2003). Kubota and
Ahmad (2006) and Kubota (2007) examined how
residents used ACs or opened windows to cool their living
space. Several studies on household energy use have also
been conducted in Vietnam (Kim et al., 2000; Le et al.,2009; Le & Yoshino, 2010; Nagasaki et al., 2011;
Sawashima & Matsubara, 2017; Le & Pitts, 2019). Kim etal. (2000) measured the indoor thermal environment(temperature and humidity) of traditional housing in
Hanoi, but because this study was conducted in the 2000s,
a time when ACs were not in widespread use, the impactof AC use was not examined. Le et al. (2009), Le &Yoshino (2010) analyzed questionnaire survey data toinvestigate the relationship between electronic applianceownership and energy consumption. Nagasaki et al.
(2011) surveyed energy consumption in six houses in Ho
Chi Minh City, the largest city in Vietnam, investigating
the hours and temperature setting of AC use. Sawashima& Matsubara (2017) surveyed four houses in Haiphong,northern Vietnam, and investigated the hours andtemperature setting of AC use. Le & Pitts (2019) studied
the energy usage patterns of 60 households in Tuy Hoa
City on the south-central coast of Vietnam. Despite thesemany studies, there are no studies that have focused on
AC use by different income groups in Vietnam.
Here, we collected basic data on AC use andhousehold energy consumption from households in
different socioeconomic classes in urban and rural areasof Vietnam. Using this data, we then considered thefollowing research questions: 1) When and how areelectric appliances used in urban and rural areas ofVietnam? 2) How has the spread of electric appliances

differed from that in other Asian countries, such as Japan?
3) What are the drivers and barriers to owning newelectric appliances, especially cooling appliances such as
ACs? 4) To what extent are people aware of energy
saving?

2. Methods
2.1 Survey Area
Vietnam is a large country with a north–southorientation. Vietnam’s climate can be divided into twozones: a tropical monsoon zone and a warm–dry winterzone. The southern part of Vietnam, especially Ho Chi
Minh City and the surrounding Mekong Delta, has atropical savanna climate, with annual average temperature
ranging from 22°C to 27°C all year round. The northernpart, including Hanoi, has four seasons, and thetemperature typically varies from 14°C to 33°C. We
accounted for the two different climates by conducting
our interview survey once in northern Vietnam (Hanoi in
March) and once in southern Vietnam (Long An Provincein August). Both surveys were conducted in 2016.
Hanoi is the capital of Vietnam and the second mostpopulated municipality. Its population exceeds sevenmillion and the main industry there is the service industry(GSO, 2020). Long An (population 2 million) is a
mid-sized province that adjoins Ho Chi Minh City and islocated at the entrance to the Mekong Delta. Since 2002
improvements in transportation access have resulted inmany factories relocating from Ho Chi Minh City toindustrial zones in Long An, which together comprise 28
industrial parks (Runckel, 2006; VOV World, 2016). The
major industry in Long An is manufacturing, which
accounts for half of the gross regional product, although
the production of raw materials in rural areas accounts forapproximately 20% of the gross regional product (GSO,
2020).
Fifteen households were selected in each region withconsideration given to ensuring a selection of households
that would represent the diversity in Vietnam with respect
to household size, monthly income and occupations offamily members. Local officials helped us selecthouseholds from each income class. Monthly incomes inurban areas of Hanoi and Long An were classified as low,
<10 million VND (457 USD; 1 USD = 21,887 VND);
middle, 10–30 million VND (457–1,371 USD); and high,>31 million VND (1,416 USD); in rural areas of Hanoi as
low, <5 million VND (226 USD); middle 5–10 million
VND (226–457 USD); and high, >10 million VND (457
USD) ; and in rural areas of Long An as low, <5 million
VND (226 USD) ; middle, 10–25 million VND(457–1,142 USD); and high, >25 million VND (1,142
USD). In Hanoi, nine households were selected from thecentral districts of Hanoi City (i.e., Ba Dinh District,Dong Da District and Hai Ba Trung District) and thefast-developing new urban district Thanh Xuan; and six

Household Survey on Air Conditioner Use and Energy Consumption in Vietnam

households were selected from a rural area (Dong AnhDistrict) (Fig. 1). In Long An, three households wereselected from Tan An City, the provincial capital, and theremaining 12 households were selected from Thanh Hoa
District, which has a town area (six households) as well as
rural areas that are characterized by a mix of Melaleuca
tree plantations and other agricultural activities (sixhouseholds).
2.2 Household Interviews
We conducted face-to-face interviews based on aquestionnaire that comprised items similar to those usedin our previous work in Chiang Rai, Thailand (Yoshida etal., 2020). The questions were asked and then answered in
Vietnamese by the head of each household or their family
members. These responses were translated immediately
into English by an attending interpreter. The survey
consisted of six parts: household attributes, ownership ofelectric appliances, use of ACs, knowledge and intention
to save electricity, information related to the purchase ofelectric appliances, and future purchasing and lifestyleprospects. The basic specifications of the household
electrical appliances, including the manufacturer’s name,model, year of manufacture and power consumption, wereidentified by inspection of the product labels or byobservation of the product’s appearance. The layout ofeach residence was recorded through photographs andhand drawings. The residential floor space was measured
in all households in Long An, but only three households in
Hanoi due to time constraints or the respondents’ refusing
permission. From 10 households in Hanoi and 11

Fig. 1

77

households in Long An, monthly electricity bills (fromone to six months) were also obtained. Each household
visit took 1–1.5 hours.

3. Results
3.1 Respondent Characteristics
Tables 1 and 2 present summaries of the households
that were visited. In Hanoi, there were six
three-generation households (40.0%), four couples or
single parents with child(ren) (26.7%), three elderly
couples (20.0%), one single-person household (6.7%),
and one other (6.7%). In Long An, there were six couples
or single parents with child(ren) (40.0%), two
three-generation households (13.3%), two elderly couples(13.3%), one single-person household (6.7%), and fourothers (26.7%). The “other” category was large in Long
An because there many more households in which the
respondents were living with a brother/sister or otherrelatives. The average number of household members was
4.4 in Hanoi and 5.1 in Long An.
In Hanoi, there were three high-income households,
four middle-income households and two low-income
households in the urban area and two high-income
households, three middle-income households and one
low-income household in the rural areas. In Long An,
there were two high-income households, four
middle-income households and three low-income
households in the urban areas and two high-income
households, two middle-income households and two
low-income households in the rural areas.

Study areas in Hanoi (left) and Long An (right).

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Household Survey on Air Conditioner Use and Energy Consumption in Vietnam

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A. YOSHIDA et al.

3.2 Housing Characteristics
In the urban areas of Hanoi, the traditional residences
are row houses (aka shop houses or pencil houses)(Shinozaki et al., 2005), which have a narrow facade, long
depth, and multiple stories (Fig. 2). The walls are made ofbrick, and the floor is either tiled or made of concrete
without any insulation. Except for at the ends of the row
house complex, sunlight cannot penetrate deep inside thehouses, which means the room temperature rarely goes
above 30°C (Thao & Nam, 2018). In the urban areas ofHanoi, the total floor area of a three-story house was
81.74 m2 (Household 3) and that of a four-story house
was 191.18 m2 (Household 9). In contrast, a typicalhousehold in a rural area (Household 15) was situated ona large plot of land (150 m2) and the total floor area of themain building and annex was 48.46 m2. The rural houses
also usually had ponds/wells, gardens and livestock huts.
In Long An, most of the residences were single-story
buildings, and the houses were relatively new comparedwith the houses in Hanoi. Several households wererebuilding their house with brick and concrete instead of
the traditional palm-leaf thatching. On average, the houses
were 14–17 years old in Hanoi and 8–9 years old in Long
An. All the residential buildings that we visited, except for
one apartment in Hanoi, were detached houses or row
houses. The average housing unit had a floor area of about
60–80 m2 and 2–3 bedrooms.
3.3 Ownership of Electronic Appliances
Televisions (TVs), rice cookers and electric fanswere items owned by most households regardless ofwhether they were located in an urban or rural area. In
urban areas of Hanoi, ACs were very popular and many
households owned two or more units; even some
low-income households owned an AC unit. Refrigerators,
washing machines and electric water heaters were also
owned by low-income households. Many households inurban areas used gas for cooking, but several had
switched from gas to electricity for safety concerns. In
(a)

(b)

Hanoi, due to the cold weather in winter, some ACs had
both a cooling and heating function, and electric water
heaters were used to heat water for bathing. Several
high-income households also had a halogen heater in theirbathrooms and a stand-up, hanging-type electric clothes
dryer.
In rural areas of Hanoi, ACs were not widely used
and only high-income households owned one, but mostrural households said they would like to have one in the
future. We also found that refrigerators, washingmachines and water heaters were owned mainly bymiddle- and high-income households. Several households
used both wood and gas for cooking.
In Long An, high-income and several middle-income
households in the urban areas owned ACs. One
high-income household in a rural area had a plan to installan AC, but most households said that they preferred fans
and the natural breeze over ACs, which is in contrast to
the rural households in Hanoi. Several households inurban areas of Long An were planning to install ACs intheir bedrooms. The main reason for purchasing an AC
was to provide greater comfort and a healthy environment
for their children while they are studying or sleeping.
Most people, excluding old people and infants, used cold
water to shower throughout the year. In general, the older
generations are comfortable with bathing with cold waterfrom a nearby river, as they have done from an early age.
However, wealthy, white-collar workers who areaccustomed to spending their whole day in an
air-conditioned office said that they preferred taking awarm shower and that this had become a habit for most ofthem.
3.4 AC Usage
In Hanoi, the main period in which ACs are used forcooling lasts three months (June–August) in light-use
households and seven months (April–October) inheavy-use households. Heating was mainly used byhigh-income households from December to February.
(c)

(d)

Fig. 2

Front view of representative housing units in urban (left) and rural (right) areas of Hanoi (a) (b) and Long An (c) (d).

Household Survey on Air Conditioner Use and Energy Consumption in Vietnam

Members of households lacking ACs with a heating
function warmed themselves using electric blankets
and/or oil heaters. In Long An, the corresponding periodof AC use in light-use households was two to six months(March–August), but heavy-use households used their AC
all year round. Also, the period of use tended to be longer
in households with higher incomes.
To understand more about the daily use of ACs, we
asked each household to tell us who switched the AC on
or off and how many hours they used the AC in eachroom. In Hanoi, eight households said that they used theAC while they slept (10 pm to 6 am). In Hanoi,
children/grandchildren tended to use ACs for longer hours
than did their parents (Fig. 3); the average daily usage
time for children/grandchildren was 8.1 h, whereas thatfor their parents it was 5.3 h. In Long An, four out of six
households also said that they used the AC while theyslept and the period of usage was one to two hours earlier
than that in Hanoi (i.e., 8 pm to 5 am).
Regarding the temperature setting, 12 households
said that they used a setting of 25°C–26°C, but somehouseholds used a setting 2°C–3°C higher or lower. It
should be noted that older family members (grandparents)
reported simply turning off the AC rather than adjusting
the temperature because they could not read the English
on the remote control for the AC unit, whereas the
younger family members (parents in their 30s and 40s andtheir children) reported being able to read the English andunderstand how to control the AC.
In response to the multiple-choice question, “Whatdo you usually do to reduce electricity consumption whenusing the AC unit to cool a room?” most people in Hanoi
chose “close windows/doors” followed by “limit thetime/hours of use,” “clean the filter” and “do not turnon/off frequently” (Fig. 4). In Long An, most people
chose “clean the filter” and “close windows/doors.” No
one in either location chose “set air flow direction tohorizontal.” Only one respondent in Long An chose “doother things,” which was to use an energy-saving mode.
Regarding simultaneous use of a fan and AC, morehouseholds in Hanoi than in Long An said that they usedboth at the same time.

Fig. 3 Daily usage patterns of air conditioning for coolingby households in Hanoi.

81

3.5 Alternative Methods of Cooling
Regarding alternative methods of cooling, in Hanoi
most people chose “open a window and let the wind in”
and “do other things” (e.g., use a hand fan), followed by“have a cold drink,” “take a shower” and “go to a public
space, shopping mall, cafe, etc.” (Fig. 5). In Long An,
most people chose “have a cold drink,” “take a shower,”“open a window and let the wind in” and “sprinkle
water,” meaning sprinkling water over the roads andpavement to lower the temperature via evaporation. No
one chose “go to a public space, shopping mall, cafe, etc.”
3.6 Energy Saving
Due to the increased ownership of electric home
appliances, electricity consumption by low-income
households in urban areas and high- and middle-income
households in rural areas of Hanoi had reached about
160–280 kWh per month (300–500 thousand VND; 14–23
USD). Electricity consumption of high- andmiddle-income households in urban areas andhigh-income households in rural areas in Hanoi hadreached 330–670 kWh per month (600–1200 thousand
VND; 27–55 USD), approximately twice that of the othergroups.
In Hanoi, monthly electricity consumption data wereobtained from monthly electricity bills provided byseveral respondents. The electricity consumption of thehouseholds with ACs was highest in summer(May–October) followed by spring (March–April) andwinter(January–February);
autumn(November–
December) was the lowest season. In contrast, theelectricity consumption of the households without ACs
remained almost the same throughout the year. In rural
areas of Hanoi, electricity consumption was highest insummer followed by winter and spring. Electricity
consumption in rural areas of Hanoi was highest in winterwhen they turned heaters on for their livestock.
In Long An, the electricity consumption of the lowand middle-income households without ACs in urban
areas and low- and middle-income households in rural
areas without ACs was a maximum of 140 kWh permonth (250,000 VND; 11 USD). In contrast, theelectricity consumption of middle-income householdswith ACs in urban areas and high-income households with
ACs in rural areas was about 200 kWh per month(400,000 VND; 18 USD). The electricity consumption ofhigh-income households with ACs in urban areas reached1,000 kWh per month (2 million VND; 91 USD).
In response to a question about the household’s
intention to save energy, 80% of the respondents in Hanoi
and 100% of the respondents in Long An said that they
tried to save energy, and almost all of these respondents
chose “economic reasons” as the trigger for wanting tosave energy. With regard to energy-saving labels onelectric appliances, the majority of respondents said thatthey did not remember seeing the labels, which suggests

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Fig. 4

A. YOSHIDA et al.

Responses to the question “What do you usually do to
reduce electricity consumption when using the air
conditioning unit to cool a room?”that the government’s publicity and advertising of themeaning of energy labels may not have been successful at
leading consumers to purchase products with high energy
efficiency.
3.7 Future Prospects
Regarding electric appliances that the respondents
planned to buy in the future, the demand for ACs washighest in Hanoi. In Long An, the demand for LEDs
(light-emitting diodes) or smart TVs was largest, with
ACs third after electric fans. Most households responded
that “money” was the main barrier to buying new
products; very few households selected “space” or“electric capacity.”
Although most of the respondents in Hanoi were
unsure about what their ideal lifestyle would be, theytended to choose “healthy” or “convenient &comfortable” instead of “environmentally friendly” astheir ideal lifestyle. In Long An, because it had beendifficult to obtain clear responses to the question about
ideal lifestyles in Hanoi, we changed the question to ask
about the changes in their living environment in the past
10 years, as well as future changes that they expected tosee in the local area over the next 10/20/30 years. Many
people said that they had seen an improvement ininfrastructure, manifested in the construction of roads, andthat they had been able to purchase household appliancesand motorbikes in the past 10 years. They said that they
hoped for more improvements in the future.
Thus, from these responses, we can infer that
Vietnamese households will likely be demanding moreconvenient and comfortable lifestyles in the future.

4. Discussion and Conclusion
How does the spread of electric appliances inVietnam differ from that in Japan in the past? In Japan in
the late 1950s, with the rapid growth of the Japanese
economy, refrigerators, washing machines andblack-and-white TVs were informally referred to as theFig. 5

Methods of cooling besides using air conditioning units
or fans (multiple responses were possible).

“three sacred treasures.” Like the Imperial Regalia, which
represent the three virtues of valor, wisdom andbenevolence, these electrical goods were said to besymbols of affluence, longing and convenience. In the
mid-1960s, the “sacred treasures” changed to cars, ACs,and color TVs; and in the 1990s to digital cameras, DVDplayers, and flat-screen TVs. Thus, the items mostcoveted by people have shifted from home appliances
related to daily life to digital home appliances related toentertainment and hobbies.
In contrast, in Vietnam in the 1990s, TVs, video
players and motorcycles were the “sacred treasures” forthe Vietnamese people (Minagawa, 1997). In fact, datafrom the Vietnam Household Living Standards Survey(GSO, 2006, 2018) have indicated that the penetration
rate of these three items was higher than that of all otheritems until the first half of the 2000s. It is interesting tonote that the penetration rate of video players was higher
than that of appliances useful in daily life such as
refrigerators and washing machines (Trinh, 2014). Since
2006, the penetration of telephones (including mobile
phones) has increased rapidly, whereas that of video/DVD
players has decreased, such that mobile phones are now
considered to have replaced video players as one of the“sacred treasures” (GSO, 2006, 2018; Trinh, 2014).
In our survey, the penetration rate of ACs was clearlyhigher among the higher income groups and many
households said they would possess more ACs if they had
enough money. One obvious factor in owning and using
an AC was “increased income.” As incomes rose, more
people came to live in modern houses and use more
electric appliances including ACs. Although theairtightness of houses in Vietnam had somewhat improved(Kim et al., 2000), most respondents reported being
dissatisfied with the indoor thermal environment because
it was not suitable for Vietnam’s hot, humid climate. The
thermal environment can be improved by using electricfans and opening windows to increase air flow; however,
several respondents pointed out that in reality thewindows cannot be opened due to noise or heat caused byHousehold Survey on Air Conditioner Use and Energy Consumption in Vietnam

urbanization or because they felt it was unsafe to have awindow open at night. Global warming appears to be an
additional reason windows cannot be opened. Together,
we conclude that these are the major factors leading
Vietnamese people to purchase and use ACs (Fig. 6).
Although the Vietnamese government has promoted
the use of products with high energy efficiency since 2003
(Nong et al., 2020), few households recognize the energy
labels on electric appliances. Koning et al. (2015) foundthat although awareness and knowledge of sustainableconsumption is generally low among the urban
middle-class in Vietnam, motivation to live healthy
lifestyles and protect the planet for future generations ishigh. Our study shows that the habit of showering withcold water has been changed by the introduction and useof ACs. As the number of people who spend more hours
in air-conditioned rooms increases, it is likely that more
people will opt to use ACs for longer hours and to takehot showers. This represents a major shift in the daily
behavior of Vietnamese people. However, this alsosuggests that promoting energy-saving lifestyles among
young people (e.g., TV commercials encouraging people
to dress in lighter clothes in the office or adopt traditional
habits such as bathing with cold water) may help to avoid
the overuse of ACs in the future.
Previous studies have suggested improving theindoor thermal environment by improving the thermal
performance of residential buildings and promoting theuse of high-efficiency ACs (Sawashima & Matsubara,
2017; Le & Pitts, 2019). We found that people’s
awareness of energy saving is still low, so these hard-type
measures are still needed. As the number of households
installing ACs increases in both urban and rural areas,
however, new measures drawing on a broader perspective
are also needed. We need to place equal importance on
soft-type policy approaches, such as publication of basic

Fig. 683

energy-saving tips for AC use and promotion ofenvironmentally friendly lifestyles.
Acknowledgement
This research was supported by the Environment
Research and Technology Development Fund (S-16-2,
JPMEERF16S11606) of the Environmental Restoration
and Conservation Agency. The authors would like tothank Dr. Eiko Kojima (formerly of the National Institutefor Environmental Studies, Japan; currently of the Japan
International Cooperation Agency) and the local
Vietnamese people who supported our field surveys in
Vietnam.
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Aya YOSHIDAAya Yoshida is a senior researcher at the
National Institute for Environmental Studies.
She has a Bachelor of Economics, a Master’s inenvironmental studies and a Doctorate in urban
engineering. Her research interests are in thearea of waste management, recycling andlifestyles.

Tran Ngoc HOANG
Tran Ngoc Hoang is a specialist in research andconsulting on environmental measurement andwaste management. He has much interest in 3R(Reduce-Reuse-Recycle) activities in Vietnam
and is currently passionately running a project
on recycling ceramic waste into usable
materials.

Tomohiro TASAKI
Tomohiro Tasaki, Ph.D, is head researcher of theMaterial Cycles and Social Systems Research
Section, Material Cycles Division, and a
researcher in the Social Systems Division of the
National Institute for Environmental Studies(NIES), Japan. He is the leader of Theme 2 of the
PECoP-Asia research project for SCP in Asia
(see http://www.susdesign.t.u-tokyo.ac.jp/s-16/).

(Received 28 May 2021, Accepted 19 August 2021)