Al Gore recently updated his Inconvenient Truth presentation and premiered it at TED last month. It's well worth watching. In it he moves beyond making the case that climate change is real and important to challenging us to act with a sense of "generational mission" to set it right. This coincides, incidentally, with his launch of a three-year, $300 million climate change campaign, one of the most ambitious and costly public advocacy campaigns in U.S. history.