The following review (not mine) on IMDB sums it up quite nicely.
Al Gore says it's so and therefore it is?
Author: pete-801-834182 from United States
30 October 2016
Basically DeCaprio was told by Al Gore (who has made a hundred millions of dollars by preaching global warming after he retired from political life, gained a bunch of weight and had nothing to do) that anthropological global warming is real, and from that point onward DeCaprio was convinced. LOL! Then DeCaprio presents the ole "97% of scientists" lie that has traveled around the world. In reality 66% of scientists have no opinion about AGW -- Those opinions were conveniently thrown out of the messaged John Cook study. Then DeCaprio presents cherry picked anecdotal evidence, without ever questioning whether it's a case of Texas Sharpshooting. Why didn't he present the Vostok Station / Greenland ice core data to put the last 100 years IN PERSPECTIVE versus the last 5,000 years, 11,000 years and 420,000 years? And if he's such a big fan of anecdotal evidence over temperature data then why didn't he mention that Greenland used to be green? That 20,000 years ago New York was covered by a mile thick glacier? Why didn't DeCaprio interview Patrick Moore, the co-founder of Greenpeace, who is not part of "Big Oil" and doesn't buy into AGW? Because DeCaprio suffers from confirmation bias. The rest of this propaganda piece (I mean movie) continues under the ASSUMPTION that humans are causing the planet to warm and we all need to agree to tax ourselves more. No thanks.