Today, Earth Day is known for feel-good concerts, eco-fairs, or recycling parties. But in 1970, Earth Day activism still had bite.

The movement to push colleges and universities to divest from fossil fuels is heating up on campuses across the country, and institutions are taking note.

As we enter 2015, the state of the climate movement is strong.

If you want to know why 11 Democratic senators support the Keystone XL pipeline, just follow the money.

The conventional wisdom says Obama should approve Keystone XL to provide cover for Democrats in 2014. But it could also turn off the voters Obama needs most.