“We’ve known about this for decades … and the problem seems to be getting worse and worse and worse.” Here’s the trailer for Before The Flood, a documentary produced and narrated by Leonardo DiCaprio that will have a theatrical run next month followed by a global TV airing a week-plus later.

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“I just want to know how far we’ve gone,” DiCaprio says, “and if there’s anything we can do anything to stop it.” There are mind-numbing and/or heart-wrenching scenes of glaciers cascading in the sea, raging floods, horrific pollution and desperate polar bears.

DiCaprio spans the globe to talk with politicians, scientists, activists — even Pope Francis — along with American dignitaries including President Obama and Secretary of State John Kerry. But America doesn’t get off lightly here, as DiCaprio notes, “The U.S. has been the biggest emitter of greenhouse gases in history.” The film also cites that “half the people in office still don’t believe in climate change.”

Fisher Stevens, who won the Documentary Feature Oscar for 2010’s The Cove, directs Before The Flood, which was penned by Cove writer Mark Monroe. Presented by National Geographic and RatPac Documentary Films and produced by DiCaprio’s Appian Way, Before The Flood will get an Oscar-qualifying run in Los Angeles and New York starting October 21. Nine days later, National Geographic Channel will air it in 171 countries spanning 45 languages.

Check out the trailer above — and the new poster below — and tell us what you think.

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National Geographic