At America's largest traveling gun show, ammo's cheap, private sales abound and the Second Amendment comes first

We're dumping greenhouse gases into the atmosphere at a dizzying pace

Texas gun owners want to expand their rights again. And this time the NRA may not be able to contain its lunatics

This is not normal: We’re on track to witness a climate unseen in 50 million years by mid-century.

As expected, the EPA gives the president a big stick to fight climate change. But will he use it?

With 94 percent of the staff on furlough, there's no one to enforce those pesky regulations

Air travel is the latest guilt trip for the environmentally conscious consumer. Here's how flying contributes to global warming and what is being done to cool the jets.

New data show that reflective surfaces offset carbon dioxide.

No hashtags or Facebook memes for the victims in St. Petersburg, where a gruesome attack is portrayed as blowback

We already have planet-cooling technology. The problem is, it’s killing us

Oil companies have been trying to rebrand themselves as cleaner and greener for years

What sets gun nuts apart from gun owners

Nothing gets Trump's febrile mob more excited than dangerous ad hominem attacks on Hillary Clinton

What if life isn't calculating, but more akin to a "puppy running amok," accidentally destroying its own habitat?

The "Cosmos" host explains the difference between weather and climate in a new clip