In a warmer world, scientists
predict that more people will get sick or die from heat stress, due not only to
hotter days but more importantly to warmer nights (giving the sufferers less
relief). More frequent and intense heat waves will further contribute to this
trend.
At the same time, there will be some decreases in the number of
cold-related deaths. Diseases such as malaria, now found in the tropics and
transmitted by mosquitoes and other animal hosts, are projected to widen their
range as these animal hosts move into regions formerly too cold for them. Other
tropical diseases may spread similarly, including dengue fever, yellow fever,
and encephalitis.
Scientists also project rising incidence of allergies and
respiratory diseases as warmer air grows more charged with pollutants, mold
spores, and pollens.
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