The film's key contention was that the increase in atmospheric temperatures observed since the 1970s was not primarily caused by emissions of greenhouse gases from burning fossil fuels.
First aired by Channel 4 in March 2007, the documentary has since reportedly been sold to 21 countries and distributed on DVD.
Dr Wunsch, from the Massachussetts Institute of Technology, said he believed he was being asked to take part in a programme that would "discuss in a balanced way the complicated elements of understanding of climate change", but "what we now have is an out-and-out propaganda piece, in which there is not even a gesture toward balance".
The Broadcasting Code requires Channel 4 to show "due impartiality" on "matters of major political and industrial controversy and major matters relating to current public policy".
The last segment of the programme, dealing with the politics of climate change, broke this obligation, Ofcom judged, and did not reflect a range of views, as required under the code.
Read from the BBC.
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