The Lancet Countdown to 2025 report warns that the health impacts of climate change are worsening, with around 546,000 people dying needlessly each year due to fossil fuel dependence and rising greenhouse gas emissions. Since the 1990s, heat-related deaths have increased by 63%. Between 2020 and 2024, 84% of heat wave days were caused by climate change. Climate change is also worsening food security, with 123.7 million people facing moderate or severe food insecurity due to more frequent droughts and heatwaves. Labor productivity losses due to heat reached up to USD 1.09 trillion in 2024, affecting low- and middle-income countries the most. The healthcare sector has reduced its greenhouse gas emissions by 16% between 2021 and 2022. The report highlights the need to rapidly phase out fossil fuels, transition to renewable energy sources and sustainable agricultural systems to protect health and save lives. Overall, it is the most comprehensive assessment of the link between climate change and health, based on 57 indicators monitored by 128 experts from 71 institutions[1][3][4].