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Europe plans to measure the role of climate change in extreme weather

Experts say that the EU will launch a service in order to assess how climate change impacts extreme weather, such as heatwaves or extreme rain. This could be used by governments in setting climate policies, improving financial risk assessments, and providing evidence in court cases.

Scientists at the EU's Copernicus Climate Change Service said the service could help governments weigh the physical risks of worsening weather, and set policy accordingly.

It's a demand to understand when an extreme event occurs, how this is related to climate changes? Freja Vamborg, the technical lead for the new service, said that it was a demand to understand when an extreme event happens and how this is related to climate change.

The European Commission didn't immediately respond to an inquiry for comment.

It will then perform attribution science by running computer simulations to see how weather systems would have behaved had people not started pumping greenhouse gasses into the air. The results of these simulations will be compared with current conditions. Copernicus, which will receive about 2.5 million euro over three years in funding, will be able to publish its results by the end next year. It also offers two assessments per month within one week of extreme weather events.

Carlo Buontempo is the director of Copernicus Climate Change Service. He said that for the first time "there will always be an attribution service operating."

"Climate Policy is unfortunately a very polarized subject again," said Friederike Otto, a climate researcher at Imperial College London. She helped pioneer the scientific approach and is not involved with the new EU service.

She welcomed plans for the service to partner with national meteorological services of EU member states, as well as the UK Met and Red Cross Red Crescent Climate Centre.

Otto added, "From this point of view it is also helpful if governments do it themselves. They can then see for themselves the real evidence that comes from their own weather services."

RISK AND LIABILITY

Independent climate scientists and lawyers praised the EU's move.

Erika Lennon, senior attorney at the Center for International Environmental Law (a non-profit organization), said: "We want the most information possible." The more we know about attribution science the easier it will become for those most affected to bring successful claims in court. The approach helps financial companies, insurance companies, and other sectors by calculating the probabilities that climate change will impact weather patterns.

Johan Rockstroem, an environmental scientist at the Potsdam Institute for Climate Impact Research, explained that "they are already using it". In-house teams calculate probabilities for flooding or storms.

Rockstroem explained that financial institutions are aware of the need to quantify risk. This is one method. In court, attribution science has been used to calculate how much a company or country's emissions have contributed towards climate-related disasters. In July, the International Court of Justice stated that attribution science was legally valid for linking emissions to climate extremes. However, it still needs to be fully tested in court. In May, a German court dismissed a Peruvian farmers lawsuit against German utility RWE over emissions-driven warming that caused Andean glaciers thaw. The court ruled that the amount of the damage claim was too low for the case to proceed.

Noah Walker-Crawford is a climate litigation researcher at the London School of Economics. He said that the court did not discuss climate models in depth or whether they were accurate. Reporting by Ali Withers from Copenhagen and Kate Abnett from Belem in Brazil; Writing and editing by David Gregorio

(source: Reuters)