Researchers used 26 years of United States Geological Survey data to calculate how many days each site in the United States experienced a heat wave per year. The team reported in October that the average number of heat wave days per river increased from 11 to 25 from 1996 to 2011.
Researchers used 26 years of United States Geological Survey data to calculate how many days each site in the United States experienced a heat wave per year. The team reported in October that the average number of heat wave days per river increased from 11 to 25 from 1996 to 2011.