The Obama administration has been procrastinating its decision on Keystone XL for years -- and now it may kick the can even further down the road.
The fast-moving ice was whipped up from melting lakes and pushed ashore by strong winds in Minnesota and Manitoba. See crazy video.
As predicted, human activities finally push carbon dioxide levels to a 3-million-year high. Climate scientists throw up their hands in exasperation.
One of Warren Buffet's companies has big plans to build turbines in Iowa, creating lots of jobs and lowering electricity bills.
It will be about twice as deep as BP's Deepwater Horizon. But, hey, nothing to worry about.
Instead of nations agreeing on greenhouse gas emissions reductions, the U.S. is pushing for each country to set its own goals.
Three of six proposed coal-export terminals in Washington and Oregon have been scrapped, and the remaining pieces of the region's coal scheme face challenges.
Tesla's all-electric Model S scored 99 out of 100 from Consumer Reports. Meanwhile, Nissan's all-electric Leaf got a top safety rating from another group.
Environmentalists sued EPA to force it to regulate oil dispersants more aggressively. With help from Big Oil attorneys, EPA won on a technicality.