Tonight at 9 p.m. on the Discovery Channel, Tom Brokaw presents "Global Warming: What You Need to Know," which is less about his journey (a la Al Gore) and more about the evidence for human-induced climate change.
Update: The link above has a listing of the other show times this week.
The program was excellent, as I expected. Brokaw talked to the big climatologists - Oppenheimer, Hansen - plus ecologists and biologists who explained the potential for a mass extinction crisis.
If you have a spare two hours this week and any of those times fit into your schedule, please sit down with your loved ones with an open mind. This issue could unify us as a country once more.