20 years later, Al Gore and his director defend their controversial climate movie 'An Inconvenient Truth'

"An Inconvenient Truth," a polemical but also wildly popular environmentalist documentary, warned that climate change is a looming threat to humanity. IMDb summarized of the film, "Filmmaker Davis Guggenheim follows Al Gore on the lecture circuit, as the former presidential candidate campaigns to raise public awareness of the dangers of global warming and calls for immediate action to curb its destructive effects on the environment."

"From my perspective, the movie is even more relevant today than when it first came out," Gore continued. "Every night on the TV news is like a nature hike through the Book of Revelation."

Guggenheim agreed, saying, "You have a whole generation that grew up with it and changed their lives because of it," he says. "That's not something one president can undo."

"That time-lapse was what we were most criticized for - we were called alarmists; we were told we were being aggressive," Guggenheim recalled. "And in many ways, you look back and it was actually pretty moderate, the way we called a lot of it."

Fox News Digital reached out to the White House and did not receive an immediate reply.