Reuters/ABC News is reporting:
An international team of scientists has found global warming, not a giant asteroid, may have nearly wiped out life on Earth some 250 million years ago.
The mass extinction, known as the "great dying", extinguished 90 per cent of sea-life and nearly three-quarters of land-based plants and animals.
There has been recent evidence that a big asteroid or meteor hit the Earth and triggered the catastrophe, but researchers say they now have evidence that something much more long-term, global warming, was the culprit.
Global warming linked to 'great dying' [ABC News, Jan. 21, 2005]
‘Great Dying’ linked to climate changes [MSNBC, Jan. 21, 2005]
Scientists link volcanic warming to Great Dying [SeattlePi.com]
via Prof. Hex