PARIS
\nFloods have been tearing a path of destruction across the globe, hammering Kenya, submerging Dubai, and forcing hundreds of thousands of people from Russia to China, Brazil and Somalia from their homes.
\nThough not all directly attributed to global warming, they are occurring in a year of record-breaking temperatures and underscore what scientists have long warned \u2014 that climate change drives more extreme weather.
\nClimate change isn\u2019t just about rising temperatures but the knock-on effect of all that extra heat being trapped in the atmosphere and seas.
\nApril was the 11th consecutive month to break its own heat record, the EU climate monitor Copernicus said on Wednesday, while ocean temperatures have been off the charts for even longer.
\n\u201cThe recent extreme precipitation events are consistent with what is expected in an increasingly warmer climate,\u201d Sonia Seneviratne, an expert on the UN-mandated IPCC scientific panel, told AFP.
\nWarmer oceans mean greater evaporation, and warmer air can hold more water vapor.
\nScientists even have a calculation for this: for every one degree Celsius in temperature rise, the atmosphere can hold seven percent more moisture.
\n\u201cThis results in more intense rainfall events,\u201d Davide Faranda, an expert on extreme weather at the French National Center for Scientific Research (CNRS), told AFP.
\nIn April, Pakistan recorded double the amount of normal monthly rainfall \u2014 one province saw 437 percent more than average \u2014 while the UAE received about two years worth of rain in a single day.
\nThis, however, doesn\u2019t mean everywhere on Earth is getting wetter.
\nRichard Allan from the University of Reading said \u201ca warmer, thirstier atmosphere is more effective at sapping moisture from one region and feeding this excess water into storms elsewhere.\u201d
\nThis translates into extreme rain and floods in some areas but worse heatwaves and droughts in others, the climate scientist told AFP.
\nNatural climate variability also influence weather and global rainfall patterns.
\nThis includes cyclical phenomenon like El Nino, which tends to bring heat and rain extremes, and helped fuel the high temperatures seen over land and sea this past year.
\nWhile natural variability plays a role \u201cthe observed long-term global increase in heavy precipitation has been driven by human-induced climate change,\u201d said Seneviratne. Carlo Buontempo, a director at Copernicus, said cycles like El Nino ebb and flow but the extra heat trapped by rising greenhouse gas emissions would \u201ckeep pushing the global temperature toward new records.\u201d
\nConsidering the overlapping forces at play, attributing any one flood to climate change alone can be fraught, and each event must be taken on a case-by-case basis.
\nBut scientists have developed peer-reviewed methods that allow for the quick comparison of an event today against simulations that consider a world in which global warming had not occurred.
\nFor example, World Weather Attribution, the scientists who pioneered this approach, said the drenching of the UAE and Oman last month was \u201cmost likely\u201d exacerbated by global warming caused by burning fossil fuels.
\nClimaMeter, another rapid assessment network who use a different methodology, said major floods in China in April were \u201clikely influenced\u201d by global warming and El Nino.
\n\u201cIt can be difficult to disentangle global warming and natural variability\u201d and some weather events are more clear-cut than others, said Flavio Pons, a climatologist who worked on the China assessment.
\nIn the case of devastating floods in Brazil, however, ClimaMeter were able to exclude El Nino as a significant factor and name human-driven climate change as the primary culprit.
\nMany of the countries swamped by heavy floods at the moment \u2014 such as Burundi, Afghanistan and Somalia \u2014 rank among the poorest and least able to mobilize a response to such disasters.
\nBut the experience in Dubai showed even wealthy states were not prepared, said Seneviratne.
\n\u201cWe know that a warmer climate is conducive to more severe weather extremes but we cannot predict exactly when and where these extremes will occur,\u201d Joel Hirschi from the UK\u2019s National Oceanography Center told AFP.
\n\u201cCurrent levels of preparedness for weather extremes are inadequate… Preparing and investing now is cheaper than delaying action.\u201d<\/p>\n","protected":false},"excerpt":{"rendered":"
PARIS Floods have been tearing a path of destruction across the globe, hammering Kenya, submerging Dubai, and forcing hundreds of thousands of people from Russia to China, Brazil and Somalia from their homes. Though not all directly attributed to global warming, they are occurring in a year of record-breaking temperatures and underscore what scientists have […]<\/p>\n","protected":false},"author":2,"featured_media":405902,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[6],"tags":[],"class_list":{"0":"post-405882","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"has-post-thumbnail","7":"category-world"},"yoast_head":"\n