HBO did a 4 part series called “Too Hot not to Handle.” It was a special documentary on global warming. They offered it free on the iTunes Music store.
I highly recommend you view this video series. All four videos total about an hour of time. It’s quite an eye opener. People think global warming is some theoretical phenomenon that we’re trying to deal with proactively. This series shows several examples and cites statistics that demonstrate that global warming is affecting our lives today. And it will only get worse.
They’ve shown comparison photos of receeding glaciers in Alaska and the Antarctic. They showed how coastal cities along the east coast of the US have to occasionally dump new sand on the beaches to counteract the rising sea levels. They talk about the abnormally high number of hurricanes in recent years and they attribute this to global warming.