Global warming isn’t just bad for the environment. There are several ways that it is expected to take a toll on human health. For starters, the extreme summer heat that is becoming more normal in a warming world can directly impact the health of billions of people.

“Extreme high air temperatures contribute directly to deaths from cardiovascular and respiratory disease, particularly among elderly people,” reports the World Health Organization (WHO). “In the heat wave of summer 2003 in Europe, for example, more than 70,000 excess deaths were recorded.”

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