Earth's worst-ever mass extinction of life holds 'apocalyptic' warning about climate change, say scientists

Runaway global warming saw the planet's average temperature hit about double what it is today about 250 million years agoResearchers studying the largest-ever mass extinction in Earth's history claim to have found evidence that it was caused by runaway global warming-and that the "apocalyptic" events of 250 million years ago could happen again.About 90 per cent of all the living things on the planet were wiped out in the Permian mass extinction-described in a 2005 book called When Life Nearly Di