The fastest-growing American cities are are also some of the places with the worst climate-change effects

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Nearly 68 million people in the U.S. were facing extreme weather alerts as of Aug. 7 — that’s about one-fifth of the U.S. population. Due to climate change, more people experience hazardous weather conditions like extreme heat, wildfires, storms and floods, and they experience them more often. Some places are more vulnerable to climate change’s impact than others, but that doesn’t stop people from moving to those spots.

A…