The title says it all in “Greedy Lying Bastards,” a blistering attack on politicians, propagandists, dissemblers and other climate-change deniers.

No longer taking the relatively polite approach of Al Gore’s “An Inconvenient Truth,” the filmmakers set out to focus on the celebrities who have been most successful in using the media to encourage a sense of doubt in a skeptical public.

With the help of Greenpeace, as well as scientists and farmers who speak freely about the disastrous impact of hurricanes and drought, director Craig Scott Rosebraugh creates a sense of urgency that’s difficult to shake.

Giving several opponents the opportunity to hang themselves with their own deceptive language, Rosebraugh establishes a debate-style approach that can be explosive — especially when Sen. Barbara Boxer finds just the right moment to declare that elections have consequences.

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Even more effective are the episodes in which Rosebraugh bears witness to the human cost of a Colorado Springs fire or a flood that leaves only debris and shocked victims in its wake.

Footage of hurricanes Sandy and Katrina is especially dramatic. A Greenland episode frankly makes the case for unprecedented disaster.

“All this was preventable,” claims the narrator, though it’s not clear how that might be true. As billionaires use their money to deny that climate change is here, or an American presidential candidate mocks climate worries in a key speech, solutions seem very far away.

John Hartl: