Midwesterners would see the biggest price increases if Keystone XL is built and Canadian oil starts bypassing American markets and heading abroad.
Carbon pricing is the big political topic down under right now, in the run-up to a federal election to be held later this year.
In a trial that began this week, the cities are trying to force paint companies to clean up hazardous lead paint in 5 million homes.
The country plans to quadruple its solar generation capacity by 2015, taking advantage of cheap solar panel prices caused by a supply glut.
Leaving mangroves, coral reefs, and other shoreline habitats intact around the U.S. could help protect more than a million people, researchers say.
One reporter looked into the Kochs' interests in the Canadian oil industry and soon found himself under attack in Facebook and Google ads.
In a hopeful sign for bee fans, the once-common Western bumblebee has been glimpsed in Washington state for the first time since the mid-90s.
The agency is proposing new limits on the amount of cancer-causing arsenic allowed in apple juice. Arsenic contamination can be caused by pesticides.
The right-wing American Legislative Exchange Council has been pushing state bills to undermine renewable portfolio standards -- and losing.