Global warming poses a dire threat...second only to nuclear weapons

Maybe I should change my homepage at work away from reuters.com, today is awash in bad news about the environment. Anytime you see a statement like, “Global warming poses a dire threat to human civilization that is second only to nuclear weapons," you have to take notice. I’d never even heard of the doomsday clock, and while the focus of the clock is on nuclear weapons, clearly they scientists involved realize other issues may be more likely to end the world than a single button.