In the 2004 eco-thriller The Day After Tomorrow, director Roland Emmerich dramatized the potential consequences of accelerated global warming. By combining stock footage with computer-generated imagery, the National Geographic special Six Degrees Could Change the World serves as a sort of nonfiction counterpoint. As NASA climate scientist James Hansen cautions, even two degrees Celsius represents a tipping point (from which there is no return). Based on Mark Lynas's Six Degrees: Our Future on a Hotter Planet and narrated by Alec Baldwin, the program roams from the bushfire-ravaged suburbs of Southern Australia to the drought-stricken farmlands of Nebraska to the rapidly melting glaciers of Greenland. In the process, aerospace engineers, marine biologists, and ordinary citizens share their experiences and predictions. In the end, it's the actual events--rather than the speculative scenarios--that prove most alarming, like the 30,000 deaths that resulted from 2003's European heat wave. While a skeptic might dismiss that tragedy as a statistical anomaly, every continent bears the scars of climate change, like the deforestation of the Amazon and the devastation wrought by Hurricane Katrina. In order to inject some levity, Six Degrees detours to look at a British grape grower who has actually benefited from his country's drier environment and the carbon footprint involved in the creation of that all-American favorite, the cheeseburger (suffice to say, it's considerable). While some of the special effects are hokey--Hansen sitting at a floating desk, for example--the preponderance of compelling data helps to compensate for such lapses.

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Documentary