BCG: Climate Inaction Will Wipe Out a Third of Global GDP
A failure to address climate change could reduce global economic output by 34% this century, says research by Boston Consulting Group (BCG).
However, BCG tempers this grim reading with a more hopeful projection: strategic investments of less than 2% of GDP could eliminate most of these losses.
The comprehensive study, conducted in partnership with the University of Cambridge, reveals that the productivity losses caused by climate change will be the main source of harm as the world warms.
"What stands out is that productivity loss — not merely capital destruction — is the primary driver of economic damage," says Kamiar Mohaddes, Associate Professor in Economics & Policy at Cambridge Judge Business School and co-author of the report.
These productivity impacts will extend far beyond sectors traditionally associated with climate vulnerability.
"It is also clear that climate change will reduce income in all countries and across all sectors, affecting industries ranging from transport to manufacturing and retail, not only agriculture and other sectors commonly associated with nature," Kamiar explains.
The economic case for immediate action
The report's analysis of economic and climate science data shows that while direct US losses from climate-attributed natural disasters totalled US$700bn between2000 and 2023, productivity losses were nearly six times greater at US$4tn.
If global temperatures rise by 3°C this century, billions of people will lose their livelihoods through reduced labour output, supply chain disruptions and the collapse of industries — from fishing to tourism and everything beyond.
However, the research presents a compelling investment case for climate action.
"The economic case for climate action is clear, yet not broadly known and understood," says Annika Zawadzki, Managing Director and Partner at BCG and co-author of the report.
By increasing investments in emissions reduction nine-fold and adaptation measures thirteen-fold, the world could limit warming to 2°C and reduce economic damage by up to 90%.
"Investment in both mitigation and adaptation could bring a return of around tenfold by 2100," Annika says.
‘A massive opportunity for humanity’
The authors describe this potential ROI as a "massive opportunity for humanity", with transformative implications.
Just an eightieth of the resulting savings (US$324bn) could eradicate global extreme poverty.
A seventh could cover all global infrastructure investment needs this century across energy, telecommunications, transport and water sectors.
The savings could also triple global healthcare spending or fund all military expenditures until 2100 with just an eighth of the total.
The message is clear: invest today or watch the costs rise tomorrow.
The necessary actions
The report outlines five key steps for mobilising action.
These are:
- Reframing the climate debate to emphasise economic costs
- Creating transparency on the net cost of inaction
- Strengthening national climate policies
- Reinvigorating international cooperation
- Advancing understanding of climate change's compounding economic impacts
This BCG-Cambridge analysis aligns with recent warnings from financial analysts, including a January report from the Institute and Faculty of Actuaries (IFoA) that unmitigated climate change could lead to a 50% loss in global GDP between 2070 and 2090.
The BCG report comes as countries prepare to submit ambitious national climate plans ahead of the COP30 climate summit in Belém, Brazil in November 2025.
As the world prepares for COP30, reports like BCG’s show that climate action is not just an environmental imperative but an economic one, with returns that could transform global prosperity and resilience for generations to come.
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