India among worst-hit nations for heatwave exposure of infants, elderly

India ranks among the top countries, along with China, the US and Russia, for heatwave exposure among infants and older adults, says the Lancet Countdown on Health and Climate Change. In 2025, older adults faced 10.8 billion person-days of heatwaves and infants 1.1 billion, the second-highest on record. Climate change caused almost 3 million heat deaths in 2016-2023, it estimates.