A new World Resources Institute (WRI) working paper has put hard numbers on what climate-driven health impacts will cost the global economy through 2050. The returns on early investment in climate health infrastructure are among the highest documented across any category of climate adaptation spending.
Climate-related health risks have moved steadily up corporate ESG agendas as a disclosure concern. A new analysis from the WRI, published in April 2026 and funded by The Rockefeller Foundation, makes a more specific argument: the cost of not investing in climate health systems is quantifiable, and the financial return on investing in them is exceptionally high.
The paper focuses on climate services for health, defined as the process of generating and applying climate knowledge to improve health decisions, disease surveillance, emergency preparedness, and health infrastructure resilience. The analysis covers 40 low- and middle-income countries representing 38% of global population.
What the WRI Analysis Found on Costs, Returns, and Implementation Gaps
The paper estimates that a median-sized developing country would need between $12 million and $18 million per year to implement a full portfolio of seven climate health activities, covering everything from hydrometeorological data systems and early warning tools to climate-resilient hospital infrastructure and community awareness programs. That is a modest number relative to what the analysis projects in return. Even under the most conservative assumptions, the study found a benefit-cost ratio of 3.6 to 1 within a five-year window. Under higher climate impact scenarios with effective implementation, that ratio reaches 68 to 1.
The reason the returns are so high is structural: the costs of climate health investment are small relative to the value of lives saved and illnesses avoided. The World Bank’s own data, cited in the paper, found that health sector adaptation investments had an average economic internal rate of return of 74%, compared to a multilateral development bank threshold of 12% and a median of 15% across all World Bank projects between 1980 and 2004.
Why Corporate ESG and Supply Chain Teams Should Be Tracking This
The WRI paper is addressed to health ministries, national meteorological agencies, and donor organizations. But the implications extend further. The 14.5 to 15.6 million projected climate-related deaths in developing markets between 2026 and 2050 cited in the analysis represent workforce exposure, supply chain disruption risk, and community stability pressure in precisely the regions where global manufacturing, agricultural sourcing, and logistics infrastructure are most concentrated. Diseases specifically modeled in the paper include malaria, dengue, cholera, diarrhea, and heat-related illness, all of which have documented effects on labor productivity and operational continuity in industrial and agricultural settings.
Only 23% of health ministries surveyed by the World Health Organization (WHO) currently have disease surveillance systems that integrate meteorological data, despite the fact that 81% of national meteorological agencies report providing climate services to the health sector. That gap represents a systemic vulnerability that private sector actors operating in affected regions are exposed to regardless of their own preparedness levels. For sustainability and EHS teams developing climate scenario analyses, the WRI framework and its seven-activity cost structure offer a concrete reference point for assessing regional health system resilience as a component of operational risk.