A message from the recent past (2009), 

President 'has four years to save Earth'. US must take the lead to avert eco-disaster. Crucially, that action will have to be taken within Obama's first administration.

So since that didn't happen, I guess that about wraps it up for Planet Earth. 

Thanks, Obama!

http://www.theguardian.com/environment/2009/jan/18/jim-hansen-obama