3.6 Health

Global warming and climate change can affect human health by altering the geographic range and seasonality of certain infectious diseases.  Food-producing ecosystems may be disturbed and make it difficult to ensure adequate nutrition in many areas. Increasing frequency of extreme weather events, such as hurricanes, droughts and floods may destroy infrastructure and in instances make it impossible to treat sewage properly and secure clean freshwater to households.

Although global warming may bring some localized benefits, such as fewer winter deaths in temperate climates and increased food production in certain areas, the overall health effects of a changing climate are likely to be overwhelmingly negative. Climate change affects social and environmental determinants of health – clean air, safe drinking water, sufficient food and secure shelter.

Extreme high air temperatures contribute directly to deaths from cardiovascular and respiratory disease, particularly among elderly people. In the heat wave of summer 2003 in Europe for example, more than 70 000 excess deaths were recorded2.

High temperatures also raise the levels of ozone and other pollutants in the air that exacerbate cardiovascular and respiratory disease.

Pollen and other aeroallergen levels are also higher in extreme heat. These can trigger asthma, which affects around 300 million people. Ongoing temperature increases are expected to increase this burden.

Globally, the number of reported weather-related natural disasters has more than tripled since the 1960s. Every year, these disasters result in over 60 000 deaths, mainly in developing countries.

Rising sea levels and increasingly extreme weather events will destroy homes, medical facilities and other essential services. More than half of the world’s population lives within 60 km of the sea. People may be forced to move, which in turn heightens the risk of a range of health effects, from mental disorders to communicable diseases.  WHO Fact Sheet (2015) Climate change and health




Home Chapter 3 3. Impacts
3.1 More water vapor
3.2 Sea level rise
3.3 Polar sea ice
3.4 Air pollution
3.5 Acidification
3.6 Health
3.7 Extreme weather
3.8 Economy
3.9 Refugees and conflicts
3.10 Glaciers
3.11 Tipping points
3.12 Biodiversity
3.13 Water
Chapter 4 4. Ecosystems