A small increase in the earth’s temperature (2 degrees Celsius), significantly increases health hazards from insects, natural disasters, and allergens. For instance, disease-carrying mosquitoes are now able to survive in areas that had previously been too cold for them. That means thousands of people in the mountains of Kenya who had no previous exposure are contracting malaria and dengue fever.
Also, global warming is changing weather patterns, producing flooding in some areas and drought in others. Flooding often pollutes the water supply, causing diseases like cholera, while drought causes crop failures and starvation.