Next time you read a magazine cover story like the one Time just published ("Be Worried. Be VERY Worried. Polar Ice Caps Are Melting ... More And More Land Is Being Devastated ... Rising Waters Are Drowning Low-Lying Communities... The climate is crashing, and global warming is to blame") you should remember one little fact: U.S. media companies, including Time Warner, donate more to the environmental movement than any other industry. Companies like The New York Times, Gannett, Tribune, ABC, CBS and NBC have donated more than a half-billion worth of ad space since the 1990s to raise money for...