Wednesday, May 16th 2012, 7:25 AM EDT
The Mayans reportedly forecast the world would end this Dec. 21 or at least the present era would. Modern doomsayers, though, tend to be less specific.
In a New York Times Op-Ed piece last week, top U.S. global-warming activist James Hansen predicted that if Canada proceeded to exploit the oil in its vast tarsands reserves and America did nothing, it would be "game over" for the climate.
Game over? Yes, sea levels would rise and destroy coastal cities, the demo-addicted NASA scientist insisted, and global temperatures would become intolerable.
"Twenty to 50 per cent of the planet's species would be driven to extinction," he said. "Civilization would be at risk."
Updated by Kenneth P. Green