The late comedian and social critic George Carlin was ahead of his time when he took a swipe at global warming during one of his acts. “We’ve only been engaged in heavy industry for a little over 200 years–200 years versus four and one-half billion,” says Carlin, who died in 2008. “And we have the conceit to think that we are somehow still a threat. That somehow we’re going to put in jeopardy this beautiful little, blue-green ball that’s just a floatin’ around the sun. The planet has been through a lot worse than us.” Listen to Carlin’s entertaining show that makes you think twice. Be forewarned that the video contains language that may be objectionable.