The Colorado Oil and Gas Association sued the two cities, and lower courts overturned the local restrictions - but cities and environmentalists are fighting back.
If oil sands did their fair share with their climate pollution, Canada would keep pace with USA and be within striking distance of our shared target. Here's what climate success would look like.
The fight to preserve a safe climate is rapidly expanding beyond governments and eco groups. Here is a quick overview of this ever widening global movement.