Lancet Countdown: Climate Health Harms Outpace Global Response
The 2026 Lancet Countdown report finds climate change caused nearly three million heat-related deaths in a decade, with health harms growing faster than governments are acting.
The 10th annual Lancet Countdown on Health and Climate Change, launched at a conference on 28 October 2026, documents a decade of worsening climate-driven health outcomes since the Paris Agreement. Between 2016 and 2023, human-induced climate change caused an estimated 369,900 out of 540,800 annual heat deaths, with 2023 alone seeing a record 710,000 heat deaths — 71.5 % attributable to warming. In total, nearly three million climate-driven heat deaths occurred over the eight-year period. Heat cut global work productivity by $1.07 trillion in 2025, representing 0.91 % of world GDP, with losses in Africa and Southeast Asia reaching 3.9 % and 3.2 % of their GDPs respectively. In 2025, extreme drought affected 51.8 % of Earth's land surface — growing 700 % faster than in the decade before 2016. Developing nations need at least $3.3 billion a year for health adaptation but received only $1.1 billion in 2024. The number of governments engaging with climate-health links has more than halved in four years even as individuals' engagement has risen sixfold. The report's authors call for climate change to be formally declared a global health emergency, arguing that clean-energy investment of $2.1 trillion in 2025 is still not moving fast enough given fossil fuels still supply over 80 % of world energy.
