ACC News Brief
Climate Solutions Global
MODELED economic assessment - not observed investment returns
UNEP models large returns from joint climate and clean-air action
What happened
A global assessment from the UN Environment Programme and Climate and Clean Air Coalition evaluates 25 measures across six sectors. It estimates that every US$1 invested could produce about US$15 in combined market and non-market benefits, or about US$4 when non-market welfare benefits are excluded. The report models gains through health, productivity, crops, ecosystems, energy security, and avoided climate damage rather than reporting observed investment returns.
ACC context
The 15-to-1 estimate includes monetized non-market welfare benefits and assumes implementation of the full measure set. The report estimates about 4-to-1 when those non-market benefits are excluded.
Why it matters
The analysis makes the economic case for coordinating greenhouse-gas and air-pollution policy, while showing how much of the headline benefit depends on health and other public value that does not appear on one balance sheet.
What to watch
- Whether governments adopt and fully implement the report's 25 measures across energy, transport, industry, waste, agriculture, and household energy.
- How results change under different valuation, discount-rate, cost, and implementation assumptions.
- Measured health, emissions, crop, and productivity outcomes compared with the modeled benefits.
Sources & evidence
- UN: Every US$1 invested in climate and clean-air action can return US$15UNEP and Climate and Clean Air Coalition release published September 7, 2026, summarizing the modeled global assessment and its assumptions.
- Hidden assets: The economic and health case for climate and clean air actionUNEP report page for the full assessment of 25 integrated measures.
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