Climate strategies are still judged largely on two dimensions: how much they cost and how many tonnes of CO₂ they save. A new study published in Communications Sustainability argues that this narrow lens overlooks much of what is at stake, and much of what the public actually cares about.
An international team led by IIASA within the Energy Demand changes Induced by Technological and Social innovations (EDITS) network assessed how six climate mitigation strategies in buildings, transport and industry affect six dimensions of quality of life, from household income and jobs to health, energy security and fairness. Using energy-system simulations for 18 countries, the researchers compared supply-side strategies (cleaner fuels and technologies, including heat pumps, electric vehicles and hydrogen substitution) with demand-side strategies (using less energy and materials through insulation and thermostat adjustments in buildings, modal shifts in transport, and greater material efficiency in industry). Each strategy was designed to deliver an identical 10 percent cut in greenhouse gas emissions.
The study is among the first to combine these objective modelling results with evidence from public surveys using the same strategies and impact data, allowing researchers to compare quantified quality-of-life benefits with citizens' perceptions.
“Mitigating climate change is too often framed as a burden, when in fact it can raise people's quality of life,” says study lead Arnulf Grubler, Distinguished Emeritus Research Scholar at IIASA. “Strategies that reduce how much energy and materials we use deliver benefits across a remarkably broad range, including cleaner air, greater energy security and fairer outcomes for poorer households, yet these gains remain consistently undervalued in policy debates.”
Broader gains from using less
All six strategies improved quality of life, but demand-side options scored slightly higher across a wider set of dimensions. Among the demand-side measures examined, improvements in building efficiency through insulation and modest thermostat adjustments emerged as the most robust performer across the study's sensitivity tests. The authors caution that their estimates, if anything, understate the true benefits, since the analysis could not capture the full spectrum of wellbeing effects.
“By modelling supply- and demand-side strategies that achieve exactly the same emissions cut across 18 very different countries, we could compare them on a level playing field,” says co-author Nuno Bento of the University Institute of Lisbon (ISCTE-IUL), who developed the simulation tool. “What stands out is how widely the benefits are shared. Both higher- and lower-income countries stand to gain, which matters for international climate negotiations.”
Public opinion defies expectations
The team then tested a widespread assumption: that people reject demand-side measures because these require personal effort, time and money. Representative surveys in the Netherlands, Brazil and China, countries with different income levels and positions in the climate debate, found the opposite.
“People expected both supply- and demand-side strategies to improve their lives and found them acceptable in all three countries,” note co-authors Linda Steg (University of Groningen) and Anne van Valkengoed (Wageningen University), who designed the surveys. “And simply showing people the evidence made their views more positive, highlighting the importance of assessing and communicating climate action beyond emissions reductions and economic costs.”
Implications for policy and negotiations
The results challenge the common assumption that demand-side climate action is unpopular and suggest that communicating wider quality-of-life benefits could strengthen public support. The findings also carry clear messages for policy.
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“Demand-side strategies deserve more weight in policy portfolios than they currently receive, and transparently communicating their quality-of-life benefits can build public support,” notes co-author Benigna Boza-Kiss, a Research Scholar in the IIASA Energy, Climate, and Environment Program and EDITS network coordinator. “The fact that both richer and poorer countries gain could help break the 'developed versus developing' stalemate in climate talks,” she concludes.
The study was carried out under the EDITS network's “Well-with-Low” fast-track project, coordinated by RITE and IIASA and funded by Japan's Ministry of Economy, Trade and Industry (METI). (hcn)
