Better climate models = worse outlooks

Source https://www.japantimes.co.jp/news/2019/09/18/world/science-health-world/earth-warming-quickly-thought-will-pass-tipping-points-sooner-new-climate-models-show

Waterways are seen in this aerial photograph taken above in Rankin Inlet, Nunavut, Canada, on Wednesday, July 31, 2019. The loss of snow and ice are causing Canada to heat up much faster than the rest of the world—more than twice the global rate of warming, according to a national scientific assessment published in April. The Canadian Arctic is one of the fastest-warming places, heating up at about three times the global average. Photographer: Cole Burston/Bloomberg

Greenhouse gases thrust into the atmosphere mainly by burning fossil fuels are warming Earth’s surface more quickly than previously understood, according to new climate models set to replace those used in current U.N. projections, scientists said.

By 2100, average temperatures could rise 7.0 degrees Celsius above pre-industrial levels if carbon emissions continue unabated, separate models from two leading research centers in France showed.

That is up to 2 degrees higher than the equivalent scenario in the Intergovernmental Panel for Climate Change’s (IPCC) 2014 benchmark 5th Assessment Report. With only 1 degree Celsius of warming so far, the world is coping with increasingly deadly heat waves, droughts, floods and tropical cyclones made more destructive by rising seas.

A new generation of 30-odd climate models known collectively as CMIP6 — including the two unveiled earlier this year— will underpin the IPCC’s next major report in 2021.

A core finding of the new models is that increased levels of CO2 in the atmosphere will warm Earth’s surface more — and more easily — than earlier calculations had suggested.

If confirmed, this higher “equilibrium climate sensitivity,” or ECS, means humanity’s carbon budget — our total emissions allowance — is likely to shrink.

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