Activists step up pressure on president to turn vague promises made since re-election into concrete policies for the future.
A nuanced plan that might actually work, if Obama goes in for it.
Does climate action make a difference if not everyone is on board?
The extreme weather events of 2012 are what we have been warning of for 25 years, but the answer is plain to see.
Negotiators meet for yet another year of slow progress on combating climate change.