If humans still exist millions of years from now, they will face inhospitably warm conditions on a supercontinent centred at the equator. Most land mammals won't be able to survive
As a result of these two trends carbon dioxide levels are likely to become higher. On scales of millions of
years, the level of CO2 in the atmosphere depends on the balance between the emissions of CO2 from volcanoes and its removal by chemical reactions with newly exposed rocks. In the dry interior of the supercontinent, less CO2 will react with rocks. “It’s a triple whammy,” says Farnsworth. He and his colleagues used a geochemical model to calculate what future CO2 levels might be like when Pangea Ultima forms, and then plugged these values into a climate model. They found that in almost all scenarios, conditions in the vast majority of the supercontinent would“We do have this upper limit with our core body temperatures that we’re not very easily able to increase,” Farnsworth says.
Birds would have a better chance, he says. Many already migrate long distances and their higher body temperatures of around 41°C means their upper limit is higher. In fact, it was recently found that
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