"Deaths. According to the Centers for Disease Control and Prevention, an average of 658 people die every year from heat-related causes. From 1999 to 2010, 8,081 heat-related deaths were reported in the United States and occurred more commonly among older, younger and poorer populations. Urban heat islands retain heat overnight, preventing people from sleeping well and leading to even more health problems, says Lucy Hutyra, an associate professor of earth and environment at Boston University. Air pollution is often worst on hot days, and when people leave windows open for air flow, the quality of the air can cause respiratory problems. Warmer, moister conditions also mean that heavy rainfall and subsequent flooding is on the rise; so far this year 78 people have died as a result, according to the National Weather Service."
"Economic Impact. According to a 2018 study by Texas A&M University: “The growing number of extreme rainfall events that produce intense precipitation are resulting in –and will continue to result in – increased urban flooding unless steps are taken to mitigate their impacts.” The 2017 National Climate Assessment concluded: “Heavy downpours are increasing nationally, especially over the last three to five decades …[and that] … increases in the frequency and intensity of extreme precipitation events are projected for all U.S. regions.” Between 2007 and 2011 alone, urban flooding in Cook County, Illinois, resulted in over 176,000 claims or flood losses at a cost of $660m (£545m)."
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