The Paleocene Eocene Thermal Maximum extinction event is considered mild compared to history's biggest extinction the Permian Triassic. But new research indicated that this global warming pulse "set off massive wildfires, forced land animal species to move pole-...." New research says it also made sections of the tropics too hot to support life, "rendering large areas uninhabitable." Most people imagine we could just farm in Siberia and Alaska, but boreal soils are quite different from presently cultivated soils. Human habitability and crop production across vast areas of the planet are under threat this Century.
During the present day, about half the human population, a good chunk of the world’s life forms, and a considerable amount of global farming occupies the tropics. However, according to recent research by the Max Plank Institute, parts of the tropical zone could be rendered basically uninhabitable to human beings by mid Century as the Earth heats up due to fossil fuel burning.
The serious concern is that as the world warms up — a humanitarian crisis of unprecedented scope could emerge as whole countries become unable to support their populations. As entire regions become too hot to live in. And as major swaths of global farmland become non-productive.
The present narrative hints that human civilization can somehow adapt by shifting farm zones northward. However, it’s worth noting that boreal regions do not support the same highly productive soils as the tropical and temperate zones that are now under threat due to rising temperatures. In addition, the nations of the world have thus far shown considerable reluctance to accepting refugee populations from destabilized zones. And as the world heats up, desperation will only increase as waves of refugees seek to remove themselves from what could well become a kind of global warming produced dead zone.
Let us not repeat the PETM extinction with a 71/2 billion people.