The problem with this topic as always is that the science just isn't clear enough to prove anything. The guy in the video is very convinced that he's arrived at a scientific conclusion from his studies that proves there is global warming (he's using that term instead of the more equivocal "climate change" which is interesting in itself), and that human activity is the cause of it, and he sketches out the theories his study eliminated which leaves this conclusion. But while I'm sure he's sincere it's basically all just his own assertion, his own conclusions, and there's just no way for a person to assess whether his study really did cover all the possibilities, really did include all the relevant information, really did prove what he says. There are others who sound just as sincere and just as aware of all the variables, who disagree with him about such scientific basics.
Well, you could look at the information yourself. You don't just have to listen to people saying "Yes it is", "No it isn't".
So there's global warming. Isn't Planet Earth subject to long-term cycles of warming and cooling according to current theory?
It is, but what of it? As an argument, that's kind of like a Holocaust denier saying "But don't Jews die of natural causes according to current theory".
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