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You are at:Home » Northern Hemisphere’s extreme drought ‘virtually impossible’ without climate change
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Northern Hemisphere’s extreme drought ‘virtually impossible’ without climate change

By mdntvOctober 6, 2022No Comments4 Mins Read
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London
CNN
 — 

Drought throughout the Northern Hemisphere this summer time — which scorched soil, dried up rivers and triggered mass crop failure — was made at the least 20 instances extra possible by the climate disaster, a brand new evaluation has discovered.

The analysis, printed Wednesday by the World Weather Attribution initiative, discovered that without the climate disaster, the drought that hit swaths of North America, Asia and Europe this summer time would traditionally be a 1-in-400-year occasion — which means it was a drought that was so intense, it might solely be seen as soon as each 400 years on common.

But world warming attributable to the burning of fossil fuels has made a drought of this magnitude a 1-in-20-year incidence, the scientists discovered.

The hovering temperatures skilled this summer time, which contributed to the drought and killed tens of hundreds of individuals throughout Europe and China, would have been “virtually impossible” without climate change, the evaluation additionally discovered.

The researchers used historic knowledge, observations and scientific modeling, evaluating circumstances underneath at present’s climate — which is round 1.2 levels Celsius hotter than it was earlier than industrialization — with the climate that preceded it, earlier than the late 1800s.

“The 2022 Northern Hemisphere summer is a good example of how extreme events caused by climate change can also unfold over large regions in longer periods of time. It also shows how the combination of many different changes in the weather can damage our infrastructure and overburden our social systems,” Freiderike Otto, a climate scientist at Imperial College London and one of many research’s authors, mentioned in a press release.

“In Europe, drought conditions led to reduced harvests. This was particularly worrying, as it followed a climate change-fueled heatwave in South Asia that also destroyed crops, and happened at a time when global food prices were already extremely high due to the war in Ukraine.”

While a lot of the hemisphere skilled below-average rainfall this yr, the evaluation discovered that growing temperatures was the primary driver behind the drought.

The scientists additionally famous their findings have been conservative, and “the real influence of human activities is likely higher” than said within the report.

Across the Northern Hemisphere this summer time, extreme warmth and low rainfall led to a number of unprecedented occasions: China issued its first-ever a nationwide drought alert; the United Kingdom recorded its highest-ever temperature; Europe skilled its hottest summer time; and the water crisis in the US West intensified, prompting new water utilization cuts.

Alongside the quick hazard to life, the summer time’s extreme warmth posed extreme threats to infrastructure, trade and food supply, fueling the continuing price of dwelling disaster in most of the affected areas.

Europe was already battling geopolitical shocks to supply. This climate-induced shock has additional “aggravated the cost of living crisis, compounding the impacts of the Ukraine war,” mentioned Maarten van Aalst, one other of the report’s authors and Director of the Red Cross Red Crescent Climate Center.

“We are witnessing the fingerprint of climate change not just in specific hazards,” van Aalst mentioned “but also in the cascading of impacts across sectors and regions.”

Scientists are more and more in a position to quantify the hyperlink between the climate disaster and extreme climate occasions. They can even extra precisely make projections.

The Northern Hemisphere can anticipate extreme temperatures — like these skilled this summer time — rather more regularly, the evaluation discovered.

“This result also gives us an insight on what is looming ahead,” mentioned Dominik Schumacher, a researcher on the Institute for Atmospheric and Climate Science at ETH Zurich. “With further global warming we can expect stronger and more frequent summer droughts in the future.”

In this case, the water shortages, wildfires, crop failures, higher food prices and depleted electricity supply skilled over the previous few months might change into commonplace.

A worker walks along a dried-up field of sunflowers near Sacramento, California, in August.

The research follows not solely a summer time of extreme climate but additionally a harmful hurricane and hurricane season. The demise toll from Hurricane Ian within the US had surpassed 100. Typhoon Noru ripped throughout the Philippines not too long ago, after quickly intensifying from the equal of a class 1 hurricane to a class 5 in round six hours.

In November, world leaders will meet in Egypt for COP27, the UN Climate Change Conference, the place extreme climate occasions this yr will possible add to the urgency of discussions.

Sonia Seneviratne, additionally a professor at ETH Zurich, mentioned: “We need to phase-out the burning of fossil fuels if we want to stabilize climate conditions and avoid a further worsening of these drought events, which will become more frequent and more intense with any additional increase of global warming.”

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