Scientist: 'We're toast' without action on global warming

• Story Highlights
• NASA's James Hansen: Greenhouse gases have passed the "dangerous level"
  
• Situation has gotten so bad the world's only hope is drastic action, he says
  
• "This is the last chance" to act, he says
  
• Hansen called a "prophet" for warning Congress about global warming in 1988
  
• Next Article in Technology »