I have only watched the first part so far. Rather than me pointing out problems I see with it, perhaps you could as some specific questions yourself. Probably the biggest problem I saw with it, and again I only watched the first part, is that they are addressing what the political said, not what the science says. So, part of what they say is correct, and some of it is a bit misleading of the science as they are addressing the politicians comments, not the specific science. And for what its worth, no climate scientists is saying that 100% of the warming is due to anthropogenic CO2. However, they do say, and show in their research that the majority of the warming is due to CO2. As for natural sources, they have been looked at extensively, there is no natural source that can explain the amount of warming that has occurred since the beginning of the industrial revolution.
Over the past 3 million years it has never been as high as it is now. Also, understand that warming due to CO2 has a logarithmic effect, thus the reason the concern for a doubling of it, "climate sensitivity". A doubling of CO2 is expected to increase GAT by around 3 deg. C regardless of the concentration, that is why comparing today's CO2 levels with those in the Mesozoic error or earlier is not valid.
Thanx for your reply Rick
Back in the 1970's when I was doing research in the area (Master's Thesis: The occurrence and causes of continental glaciation), the position of the continents, ocean circulation, and orogenic processes were a major factor in affecting climate. However, keep in mind that the timeline then was on the order of tens to hundreds of millions of years. What we are seeing in the rate at which it is occurring past 150 years is unprecedented by any paleoclimate data. Yes, climate has changed in the past and it will continue to do so. The difference is that the additional CO2 going into the atmosphere through the usage of fossil fuels. We also know that the additional levels of CO2 are indeed from fossil fuels by way of atmospheric and oceanic carbon isotope ratios. As for sediment run off, that is not an issue. Ice melt is a problem but not all the ice is expected to melt, especially that of the Antarctic, where topography is the major influence, unlike the Arctic which has no topography.