Scientific American:

250 million years from now, the emergence of a new supercontinent could render most of Earth’s surface uninhabitable for mammals

By Jonathan O'Callaghan, Nature magazine on September 27, 2023

Up to 92% of Earth could be uninhabitable to mammals in 250 million years, researchers predict. The planet’s landmasses are expected to form a supercontinent, driving volcanism and increases to carbon dioxide levels that will leave most of its land barren.

“It does seem like life is going to have a bit more of a hard time in the future,” says Hannah Davies, a geologist at the GFZ German Research Centre for Geosciences in Potsdam. “It’s a bit depressing.”

Earth is currently thought to be in the middle of a supercontinent cycle as its present-day continents drift. The last supercontinent, Pangaea, broke apart about 200 million years ago. The next, dubbed Pangaea Ultima, is expected to form at the equator in about 250 million years, as the Atlantic Ocean shrinks and a merged Afro-Eurasian continent crashes into the Americas.

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