Filmaker Martin Durkin's documentary "The Great Global Warming Scandal" says the sun, and not human-generated greenhouse gases, is to blame for the increase in the Earth's temperature, The Washington Times reported.
Durkin says the greenhouse theory is "the biggest scam of modern times."
The program, scheduled for broadcast Thursday on Britain's Channel 4, features experts in climatology, oceanography, meteorology, biogeography and paleoclimatology, the newspaper said.
University of Ottawa paleontologist Ian Clark says global warming could be caused by increased activity on the sun. Clark said polar ice-core samples show that "warmer periods in Earth's history have come about 800 years before rises in carbon dioxide levels."
Scientists in the documentary also say most of the recent global warming occurred before 1940, followed by a 40-year temperature drop. They say the carbon dioxide created during the post-World War II economic boom should have caused a rise in global temperatures.