Just what the world needs: another piece of agitprop about global warming disguised as a documentary. The new “Everything’s Cool” is the best movie I’ve ever seen about global warming for kids in junior high school, but it’s the most annoying movie about global warming I’ve ever seen for adults.

Tracking the evolution of the debate on global warming from its contentious beginnings through its post-Katrina mainstream acceptance, “Everything’s Cool,” by Daniel B. Gold and Judith Helfand, has attitude to burn, not to mention snappy editing, corny jokes, slick photography, and a peppy soundtrack. But it mistakes its assertions for facts and gives self-congratulatory gasbags too much camera time.

When “Everything’s Cool” is in the trenches, it’s a fascinating movie. Watching the Weather Channel’s Dr. Heidi Cullen, the network’s first global warming reporter, transform herself from a camera klutz into a confident on-air personality, or seeing the affable Rick Piltz, the Bush Administration’s global warming whistleblower, bumping awkwardly into his Capitol Hill nemesis while giving an interview, is priceless. But the preschool-ready description of NASA as “a government agency responsible for protecting our planet” is cheap.

On the positive side, there’s very little of Al Gore. On the negative side, there are endless blasts of hot air from Bill McKibben, described unappealingly as “the poet laureate of climate change.” Even the filmmakers don’t seem to realize that their movie’s unlikely hero is a humble snow-groomer named Bish Neuhouser who gets together with his buddies to make biodiesel in his garage. Cigarettes hanging out of their mouths, slinging toxic chemicals like cookie dough, these guys are the Big Lebowskis of environmentalism: all-American dudes who regard climate change as a problem they can solve over the weekend with some tools and some beer.