Enviros criticized the methodology and scope of a study that found tar-sands pipelines to be just as safe as regular oil pipelines.
The number of bumblebees killed by a pesticide application in Oregon has risen to 50,000, and nature lovers are calling for stronger regulation of neonicotinoid insecticides.
An EPA rule cracking down on power-plant pollution that crosses state borders was struck down by a federal court last year. Now the Supremes will hear the case and could reinstate the rule.
Markey handily beat Republican Gabriel Gomez in the Massachusetts special election, thanks in part to millions of dollars poured into the race by enviros.
Epic floods forced more than 100,000 people to flee their homes last week in Alberta, Canada, prompting questions about the link between climate change and flooding.
Climate activists are pushing a state ballot measure that would tax carbon emissions from gasoline, heating oil, and other fossil fuels.
Water wells close to natural-gas operations in Pennsylvania were more likely than others to be contaminated with dissolved methane and other gases, researchers found.
In his big climate speech, Obama says the Keystone XL pipeline won't be in the nation's interest if it markedly worsens climate pollution.
An unforgiving article in Foreign Policy magazine describes Prime Minister Stephen Harper's reckless pursuit of oil-sands wealth.