Michael Moore - yes that lefty, green radical - has had death threats and censorship (they tried to take his film off Youtube) over this documentary. Here's the condensed version
https://www.youtube.com/watch?v=DQ0utEg7vkg Basically, it exposes the empty virtual signalling and false claims of the Green Tech Industries.
Unless we tackle the source of the problem which is too many people (9 billion) on the planet, all understandably wanting so-called First World consumerist lifestyles, than no amount of wind power or tidal schemes are going to make a heap of difference to global climate change (if you believe in it) or irreparable global poisoning, through pollution, of our ecosystems.