The history of genetic mixing indicated WAIS collapsed at two separate points -- first in the mid-Pliocene, 3-3.5 million years ago, which scientists were already confident about, and the last time in a period called the Last Interglacial, a warm spell from 129,000 to 116,000 years ago.
"This was the last time the planet was around 1.5 degrees warmer than pre-industrial levels," said Lau. Human activity, primarily burning fossil fuels, has so far raised global temperatures by 1.2C compared to the late 1700s.
There were a handful of studies prior to the new Science paper that also suggested WAIS collapsed some time in the past, but they were far from conclusive because of the comparatively lower resolution genetic and geological data.
"This study provides empirical evidence indicating that the WAIS collapsed when the global mean temperature was similar to that of today, suggesting that the tipping point of future WAIS collapse is close," the authors wrote.
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2023-12-23 08:56:25Z
CBMiP2h0dHBzOi8vZW4ucHJvdGhvbWFsby5jb20vZW52aXJvbm1lbnQvY2xpbWF0ZS1jaGFuZ2UvN2p0eGpjbm9hYdIBSWh0dHBzOi8vZW4ucHJvdGhvbWFsby5jb20vYW1wL3N0b3J5L2Vudmlyb25tZW50L2NsaW1hdGUtY2hhbmdlLzdqdHhqY25vYWE
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