Parts of Earth’s ice sheets that could lift global oceans by metres will likely crumble with another half degree Celsius of warming, and are fragile in ways not previously understood, according to new research.
PARIS, France —
These kilometres-thick ice cubes have replaced glacier melt as the single biggest source of sea level rise, which has accelerated three-fold over the last decades compared to most of the 20th century. Looking only at a 2100 horizon is misleading, because oceans will continue to rise for hundreds of years no matter how quickly humanity draws down emissions.
“Our model has a threshold between 1.5C and 2C of warming — with 1.8C as a best estimate — for acceleration of ice loss and sea level increase,” co-author Fabian Schloesser from the University of Hawaii, told AFP. An international expedition of British and US scientists drilled a hole the depth of two Eiffel towers through the thick tongue of ice Thwaites has pushed out over the Southern Ocean’s Amundsen Sea.
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