The ruling is a particularly harsh kick in the gut to climate cooperation. The ink is barely dry on the U.N. Paris Climate Agreement, but clearly trade still trumps real action on climate change.

Will this film change everything? Absolutely not. But you could, by answering its call to action.

What we need from Exxon is what they’ll never give: a pledge to keep most of their reserves underground, an end to new exploration, and a promise to stay away from the political system. Don’t hold your breath.

President Obama's plan to tackle global warming is in considerably less legal peril than it was just three days ago, but there are still two major ways the Clean Power Plan could die or get weakened significantly.

Last month, state regulators gave in to PG&E's demands and made it tougher to expand large-scale solar projects. Now, the utility wants to roll back incentives for rooftop-solar energy.

It is an expression of dismay that world leaders continue to fail to focus their efforts and the world's attention on reducing the extreme danger posed by nuclear weapons and climate change.

If you build a pipeline in 2016, the investment will be amortized for 40 years or more. It is designed to carry coal slurry or gas or oil well into the second half of the 21st century - in other words, it's designed to do the very thing scientists insist...

The threat of jail is real to activists who use civil disobedience. But now activists now have a powerful form of defense: necessity.

The fate of our Earth and putting threats into perspective for 2016.

The disagreements between groups on the left reflects not so much different policy goals as different metrics for judging success.