Europe, China and North America were parched by extreme heat that would have been 'virtually impossible' without the effects of global warming, scientists said.
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Human-caused global warming has made severe droughts like the ones this summer in Europe, North America and China at least 20 times as likely to occur as they would have been more than a century ago, scientists said Wednesday.
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"The impacts are now very clear to people, and they're hitting hard," Dr. van Aalst said.
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For the Northern Hemisphere region, the scientists found that, because the planet has already warmed by 2.2 degrees Fahrenheit (1.2 Celsius) since the late 1800s, this summer's low moisture levels in the first few feet below the soil's surface, where many plants' roots draw water, had been at least 20 times as likely to occur compared with a hypothetical world with no burning of fossil fuels.
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