At least the guy does show correctly that temperatures are roughly similar to now from 7500 BCE to 3000 BCE, dropped until 1700 and started rebounding.
Unlike a lot of folks here and more in line with general consensus, I do suspect humans have impacted our global climate. To how what extent, what impact it is having, how we should resolve any issues, etc is where I differ from a lot of the green folk and professional climate change crowd. I'd like to know the real measurable impact without 'corrected' data (raw only please), quality measurements on the measuring stations, etc. Then as good of a survey as we can on the current impact. Then a list of the possible solutions with associated costs.
Chlorofluorocarbon were pretty straightforwardly proven to cause issues with the Ozone layer. They are the example I most often use of actually doing environmentalism correctly. The problem was identified. We worked out accurate scientific data of what CFCs in what amounts do. We worked out acceptably economic alternatives. Paul Crutzen, Mario Molina and Sherwood Rowland were the most famous scientists involved, and won the Nobel Prize for Chemistry in 1995. Realistic treaties were written, with realistic deadlines. There was no guesswork, complete reliance on theoretical models, interpreted data, etc. Actual consequences were accurately assessed. There was hysterical shrieking, but mostly from the usual suspects and generally not from the scientists involved. In other words, how it should be handled. Perfect, fair from that. But it went mostly smoothly and was validated every step along the way. The ozone layer these days is on the mend, which is nice.
I tell the hippies that I and plenty of others are willing to do environmentally friendly stuff. Provided it can be logically and economically presented. If CFC alternatives are 10% less efficient (ie need 10% more power for same cooling), I'm willing to pay that if it can be reasonably proven that skin cancer, cataract surgery, crop damage, etc will outweigh that cost by a significant percentage. "Go live in a yurt, you evil polluter!" is not a reasonably proven economic solution.