Extreme heatwaves that previously only struck once every 50 years are now expected to happen once per decade because of global warming, while downpours and droughts have also become more frequent, a UN climate science report said on Monday.
Heatwaves show stronger increases in frequency with warming than all other extreme events. Twice in a century heatwaves could happen roughly every six years with 1.5 degrees Celsius of warming, a level which the report says could be surpassed within two decades.
Carolina Vera, another report author and a physical climate scientist at University of Buenos Aires and Argentina's main agency for science research , said there is also an increasing likelihood that multiple extreme weather events could happen at the same time. The IPCC has a medium or high-level confidence that many important agricultural regions around the world will see more droughts or extreme rain. That includes parts of Argentina, Paraguay, Bolivia and Brazil that are major growers of soybeans and other global commodities.
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