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As world leaders gather in Paris to talk about climate change, one phrase that will dominate conversations is "two degrees."

The 1997 Kyoto treaty set targets for cutting greenhouse gas emissions that many nations didn't meet. This time, stakes are higher and all countries will be asked to set and meet their own limits.

Sixty years ago Tuesday, Rosa Parks was arrested for refusing to give up her seat on a bus. Recruits in Montgomery, Ala., are learning about Parks in a course aimed at eliminating bias in policing.

One was wearing a gas mask, and they appeared to have assault rifles. The California Highway Patrol shut down the freeway. The threat was eased when the young filmmakers surrendered.

Leaders from around the world are converging on Paris for the 2015 U.N. Climate Change Conference. Listen to our special coverage to find out what you should know and what's at stake.

Named Sustainability Base, a NASA facility in California is a model for energy-efficient federal buildings. It's powered by a fuel cell like those used on spacecraft and recycles water for flushing.

The "brandalists," as they call themselves, used commercial ad space to point out the damage they say big corporations are having on the world's environment.

Ho ho ho, you've shopped till you've dropped a bundle. Now along comes #GivingTuesday. Is this the best way to encourage charity in the holiday season?

It took about 30 teams of scientists worldwide, using supercomputers to churn through mountains of data, to see patterns aligning of what will happen decades and centuries from now.

The suspect in the shooting at Planned Parenthood in Colorado Springs was in court Monday. Robert L. Dear faces multiple counts after the deadly attack that left three people dead and nine wounded.