In a summer already full of extreme weather, it's the heat waves roasting hundreds of millions of people across three continents that are confirming a grim climate prophecy for many experts.
, scientists determined that record-shattering heat events are up to seven times more likely to occur between now and 2050, and more than 21 times more likely to occur from 2051 to 2080.early this summer demonstrated how dangerous heat extremes can be. Hundreds of deaths were linked to the June heat wave, and more than 35 cities across Washington state and Oregon tied or set new temperature records.
Heat waves occur naturally in the summer, but climate change is exacerbating these events because emissions of heat-trapping greenhouse gases are causing average temperatures to increase. These changes to baseline temperatures mean that when heat waves do occur, they are more likely to be severe, said Gerald Meehl, a senior scientist at the National Center for Atmospheric Research in Colorado.
Global warming can also create feedback loops that then make other extreme events more likely to occur. Droughts, for instance, can intensify heat waves because the sun can more easily heat the ground when there is less moisture in the soil to evaporate.
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