250 million years from now, the emergence of a new supercontinent could render most of Earth’s surface uninhabitable for mammals
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.
Modelling the climate of the new supercontinent, described on 25 September in Nature Geoscience, Alexander Farnsworth at the University of Bristol, UK, and his colleagues found that much of Pangaea Ultima will experience temperatures of higher than 40 °C, making it uninhabitable to most mammalian life.
In a worst-case scenario, in which CO2 levels reach 1,120 parts per million, more than double current levels, just 8% of the planet’s surface — coastal and polar regions — would be habitable to most mammalian life, compared with about 66% today. Survival hopes Davies, who has previously studied the formation of Pangaea Ultima, says that it is possible that some mammalian life might survive the environmental changes. “Whether or not they all go extinct is just one outcome, but it’s not the [only] outcome,” she says. It’s also not certain where Pangaea Ultima will form.
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