Overview. Climate change presents a fundamental threat to human health. It affects the physical environment as well as all aspects of both natural and human systems – including social and economic conditions and the functioning of health systems.

The Lancet Countdown: Tracking Progress on Health and Climate Change is an international research collaboration that monitors and reports annually on the relationship between health and climate, and its implications for national governments.

Air pollution greatest global threat to human health, says benchmark study.

Climate change is the biggest threat to global public health in the 21st century. From the increase in death and illness due to severe weather to worsening air quality, changing patterns of infection, and disruption to food supplies, the health effects of climate change are far reaching.