Researchers are evaluating which climate change adaptation strategies, from heat warning systems to passive cooling, effectively reduce heat-related illness and death.
Key facts
- •Lowering New York City's heat alert threshold in 2008 resulted in a more than 50% reduction in hospitalizations for heat stroke.
- •A 2025 study found that heat exposure prevention plans were associated with a 25% reduction in heat-related deaths across Europe.
- •Limiting global warming to 1.5 degrees Celsius could prevent 11,600 wildfire smoke-related deaths in the U.S. annually compared to 3 degrees Celsius of warming.
- •Cooling centers are widely used, but there is very limited evidence that they effectively reduce deaths or hospitalizations because they are underutilized.
- •In Southeast Asia, green infrastructure has been shown to reduce air temperatures by up to 4.7 F and surface temperatures by 19.8 F.
As global temperatures rise, experts are identifying which public health interventions effectively protect populations from extreme heat and wildfire smoke. While some strategies, such as New York City's heat emergency plan, have demonstrated significant reductions in hospitalizations, researchers note that evidence for the effectiveness of other common measures remains limited. The consensus among scientists is that reducing carbon emissions remains the most effective way to avoid the worst health outcomes.
By the numbers
Heat Warning Systems and Targeted Outreach
New York City's 2008 decision to lower its heat alert threshold—triggering emergency measures at 100 F for one day or 95 F for two consecutive days—correlated with a more than 50% reduction in heat-related hospitalizations. Experts emphasize that effective systems must go beyond simple alerts to include coordinated actions like outreach to vulnerable groups and utility protections. A 2025 study found that such prevention plans led to a 25% reduction in heat-attributable deaths across Europe.
Cooling Technologies and Workplace Safety
Mechanical cooling, such as air conditioning, is linked to lower hospital admissions and heat-related deaths, though it remains limited by power grid vulnerability and the 'heat or eat' dilemma, where families struggle to afford energy bills. For outdoor workers, strategies implemented by La Isla Network in Central America—mandating rest, shade, and hydration—have successfully reduced heat-related kidney failure and illness while increasing productivity.
Passive Cooling and Infrastructure
Passive cooling techniques, including reflective 'cool roofs' and increased urban greenery, offer low-cost ways to lower indoor and surface temperatures. Modeling studies suggest these measures could significantly reduce heat-related deaths and heat wave exposure. However, experts caution that interventions must be carefully planned, as strategies that reduce heat-related deaths could potentially worsen outcomes from cold, which remain four times more common globally.
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This article was independently rewritten by ManyPress editorial AI from reporting originally published by Live Science.
