World health organization

10 facts on climate change and health

A woman, who is a malaria patient, sits on a bed after a blood test in Chad.
WHO/Benoist Matsha-Carpentier

Climatic conditions affect diseases transmitted through water, and via vectors such as mosquitoes. Climate-sensitive diseases are among the largest global killers. Diarrhoea, malaria and protein-energy malnutrition alone caused more than 3 million deaths globally in 2004, with over one third of these deaths occurring in Africa.

© WHO. All rights reserved.