National Geographic released Before the Flood over the weekend, and it is a calm but clear-eyed overview of the scope of the environmental crisis facing our planet. It also looks at pragmatic steps we can take right now to slow the damage.
Produced by National Geographic and hosted by U.N. Messenger of Peace Leonardo DiCaprio, it avoids the hyperbole that often turns skeptics off on these documentaries. DiCaprio spent three years interviewing people around the world about their local and regional challenges, as well as the options for addressing those.
They also have a great interactive map where you can look at what small increases in global temperatures will do to sea levels. Manhattan, New Orleans and about one-third of Florida would be imperiled in the worst-case modeled on the map.