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How does climate change affect the spread and increase occurrence of disease across the world?
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Climate change will increase the occurrence of heat-related diseases and diseases carried by insects, as well as food-borne and water-borne diseases which thrive in warmer, wetter conditions.  

Rising global temperatures and increasing numbers of heat wave events will increase humanity‚Äôs vulnerability to heat-related diseases, such as heatstroke, heat exhaustion and cardiovascular disease. For example, on average, extreme heat kills more Americans every year than floods, hurricanes, lightning, and tornadoes taken together. 

Also, the climate becoming warmer and wetter will expand the range of insects that carry devastating infectious diseases, such as malaria and dengue fever, which will allow them to infect and kill more people each year. 

Bibliography:

Centers for Disease Control and Prevention 2013

World Health Organisation 2018

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