BC3 participa en la jornada sobre el Plan Social para el Clima en el Congreso
Congratulations to new BC3 PhD graduate Logolié Yamat
New BC3 research shows how climate action design is not only a cost issue
For years, climate policy has been heavily guided by Integrated Assessment Models (IAMs) that prioritize one main objective: reducing emissions at the lowest possible monetary cost. However, a new study published in Nature Climate Change and led by BC3 suggests that this narrow focus might be blinding us to the broader picture.
The research introduces a novel framework that combines the Global Change Analysis Model (GCAM) with multi-objective optimization (AUGMECON). This approach successfully internalizes the impacts of climate policies on poverty, health, water, economic growth, and biodiversity right from the design phase, rather than assessing them as an afterthought.
The results show that “Sustainable Development Goals (SDGs)-balanced” mitigation pathways that not only tackle global warming but also actively improve global well-being can be designed.
“These strategies consistently outperform conventional least-cost methodologies across nearly all measured sustainability indicators”, highlights Dirk-Jan Van de Ven, lead author and researcher at BC3.
According to the study, these approaches deliver significantly higher avoided premature mortalities from air pollution and reduce potential species loss due to habitat destruction. Crucially, the research group found that these massive gains in public health and biodiversity can be achieved without a significant increase in total economic costs. For instance, in the ambitious 1.5°C scenario, SDG-balanced strategies can achieve up to 149,700 avoided premature mortalities and secure a substantial reduction in potential species loss (-282 species).
Traditionally, models used to determine climate change mitigation pathways often favor a uniform, global carbon price. However, the BC3-led research demonstrates that optimal outcomes require tailored mitigation efforts across different sectors.
- High-potential sectors like Energy Supply and Industry remain primary targets and shoulder the bulk of the mitigation burden in SDG-balanced portfolios.
- For sectors like Transport and Buildings, which already undergo profound transformations under non-mitigation pathways as new technologies like electric vehicles and heat pumps are becoming cost-efficient even in the absence of policy, additional mitigation beyond these technologies is treated more cautiously in SDG-balanced portfolios to protect citizens from increased poverty risks and safeguard economic growth.
- The Agriculture, Forestry, and Other Land Use sector must be managed strategically; while it offers high potential for biodiversity co-benefits through land conservation, over-reliance on it can exacerbate poverty by driving up food prices.
- Technologies like Direct Air Capture, abstracting CO2 directly from the atmosphere, act as a “last resort” lever, capturing CO₂ with minimal impacts on other SDGs (either positively or negatively).
While the 2°C and 1.7°C scenarios offer room to balance climate goals with other societal needs, the study highlights a stark reality regarding the ambitious 1.5°C target. As mitigation targets become stricter, the flexibility to optimize for non-climate SDGs rapidly declines.
To limit global warming to 1.5°C, nearly all mitigation potential across every single sector must be exhausted. This leaves policymakers with almost no room to shift efforts away from sensitive sectors (like agriculture or buildings) to protect specific SDGs, making trade-offs “markedly harder to bridge.” The findings from Van de Ven and the BC3 team, in collaboration with teams in Greece and the United States, offer a powerful tool for policymakers. By shifting away from purely cost-obsessed models to those that highlight tangible co-benefits such as cleaner air, protected wildlife, and safeguarded economic stability, governments can significantly increase the public’s willingness to support and pay for ambitious climate policies.
The research proves that the complex interdependencies between the Paris Agreement and the United Nations’s 2030 Agenda require deep, integrated planning. Climate action does not have to be a purely economic sacrifice; designed correctly, it can be a catalyst for comprehensive global development.
