What's The Leading Cause Of Wildfires In The U.S.? Humans
More than 8 in 10 fires are started by people. Researchers say humans are not only causing the vast majority of wildfires, they're extending the normal fire season around the U.S. by three months.
Đọc thêm tại NPR
at February 28, 2017 at 03:01AM
Health & Science
Thứ Ba, 28 tháng 2, 2017
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