Pope Francis welcomes Obama's Clean Power Plan, arguing 'climate change is a problem which can no longer be left to a future generation'
Republicans open up new fronts in attempt to stop the Environmental Protection Agency regulating greenhouse gas emissions
Senate votes overwhelmingly that climate change is real, but GOP Senators line up to reject scientists' warnings that humans are a cause
President uses State of the Union to warn that he will not let Congress turn back the clock on climate action
Controversial bill supporting project will be debated in the Senate after winning House approval, but President is expected to veto it
A Republican-controlled Congress spells bad news for the green economy and UN climate change talks, but will it prove as disastrous as some environmentalists fear
Senators promise that all night debate on climate change will be followed by renewed push to eventually deliver Congressional action