Former vice president and climate change activist Al Gore is concerned that a potential Donald Trump presidency could roll back progress in the fight against climate change.
"He has said some things on the climate crisis that I think should concern everyone,'' Gore said in an interview with NBC's "Today" show.
Trump has called climate change a hoax created by China.
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In the Oscar-winning documentary "An Inconvenient Truth," Gore used charts and graphs to make the connection between increasing carbon emissions and the changing climate.
To mark the 10th anniversary of the film's release on Tuesday, Paramount is offering free downloads of it on Amazon, XFINITY on demand, iTunes and other digital retailers.