Last year, a documentary was made titled, “The Great Global Warming Swindle” which seemed to be a direct rebuttal to Al Gore’s film “An Inconvinient Truth”. I have just seen that documenary and quite simply, it is a load of CRAP!
There are several things blatantly wrong with it.

1. The film asserts, without any actual evidence, that the Medieval Warm Period was indeed warmer than today. For the explanation of that assumption and its refutation, go here:  https://dalehusband.wordpress.com/2008/05/26/debunking-the-mwp-myth/
2. The film nowhere mentions the planet Venus, yet it is there that the power of the greenhouse effect, which the film seems to deny, becomes most obvious. Venus, on both its day and night sides, is far hotter than the day side of Mercury, which is much closer to the Sun! Although the clouds of Venus shield the planet’s surface from most of the sunlight, the atmosphere, which is mostly carbon dioxide (CO2), traps the little heat that gets through.
3. The film indicates that there was one obscure scientist that claimed that the greenhouse gases could cause global warming in the 1970s and that he was ridiculed by most scientists at the time. This is simply a lie! In fact, the relationship between carbon dioxide and global temperatures was understood by most scientists since the 1900s.  The scientist who discovered it was world famous, even winning the 1903 Nobel Prize in Chemistry.  His name was Svante Arrhenius. http://en.wikipedia.org/wiki/Arrhenius#Greenhouse_effect_as_cause_for_ice_ages   http://royalsociety.org/page.asp?id=5971  http://nobelprize.org/nobel_prizes/chemistry/laureates/1903/arrhenius-lecture.html http://www.globalwarmingart.com/wiki/Image:Arrhenius_pdf
4. The film claims that “all the climate change models” predicted that the temperatures of the lower atmosphere would be less than the upper atmosphere and that the discovery that this was not the case falsified the models. But this is flatly contradicted by a statement in Al Gore’s book “An Inconvenient Truth”. He said, “Global warming heats the lower atmosphere but actually cools the stratosphere…”  This makes sense when you realize that CO2 is heavier than the nitrogen and oxygen that make up most of the Earth’s atmosphere, and therefore would tend to be lower in the atmosphere. An increase in the proportion of CO2 would only be felt closer to the ground, not farther from it.
5. The film claims that water vapor is a far more important greenhouse gas than carbon dioxide. But that is not true, because water vapor forms clouds that actually block sunlight and thus act to cool the Earth, providing a counter to the greenhouse effect of carbon dioxide. By contrast, CO2 never forms clouds and thus can ONLY be a greenhouse gas.
6. The film claims that the global warming movement was started by British Prime Minister Margaret Thatcher as a way of promoting nuclear power at the expense of fossil fuels. This is nonsense, because while nuclear power may not release greenhouse gases, it causes other types of pollution and has its own grave risks, plus like fossil fuels it is nonrenewable.
7. The film claims that efforts to wean poor countries in Africa off fossil fuels and onto solar energy is harmful to their well-being. Never mind the fact that depending on fossil fuels would require an unlimited number of monthly payments to the big energy companies. But using solar panels, however expensive they may be at first, would only require a one-time payment. Plus, efforts to mass produce solar panels would eventually drive their costs down, if only the big energy companies would permit it. And there is an entire vast region, the Sahara Desert, where millions of solar panels could be built and maintained to supply most of Africa with energy.

Need I go on?