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From the article:Included [in the film] are claims that carbon dioxide is not a pollutant, that scientific consensus has not been reached — or alternately that consensus is not useful or desirable — and that there is no evidence that humans are contributing to climate change.

These are not all substantive criticisms. Saying that CO2 is or is not a "pollutant" is meaningless. There is some consensus: CO2 does warm the atmosphere and increasing amounts will warm it more. But there is little consensus on how much and none on predictions (or claims) of catastrophe. It is true that there is no incontrovertible evidence that humans contribute to (ill-defined) climate change, warming has other explanations. But there is also no incontrovertible evidence that natural factors explain all of the warming. It is most likely a combination.