In eye-opening testimony before a Senate subcommittee, the co-founder of the environmental activist group Greenpeace refuted assertions that carbon dioxide emissions from human activity are responsible for global warming.
He also said a warmer temperature would be "far better" than a cooler one.
Patrick Moore, Ph.D., testified before the Senate Environmental and Public Works Committee's Subcommittee on Oversight on Feb. 25.
"There is no scientific proof that human emissions of carbon dioxide are the dominant cause of the minor warming of the Earth's atmosphere over the past 100 years," said Moore, who left Greenpeace in 1986 due to what he called its "sharp turn to the political left."
"The Intergovernmental Panel on Climate Change (IPCC) states: 'It is extremely likely that human influence has been the dominant cause of the observed warming' since the mid-20th century.
"'Extremely likely' is not a scientific term but rather a judgment, as in a court of law."
Moore, chairman emeritus of Greenspirit Strategies in Vancouver, Canada, also told the subcommittee: "Perhaps the simplest way to expose the fallacy of ‘extreme certainty’ is to look at the historical record. When modern life evolved over 500 million years ago, CO2 was more than 10 times higher than today, yet life flourished at this time. Then an ice age occurred 450 million years ago when CO2 was 10 times higher than today.
"The fact that we had both higher temperatures and an ice age at a time when CO2 emissions were 10 times higher than they are today fundamentally contradicts the certainty that human-caused CO2 emissions are the main cause of global warming.
"The increase in temperature between 1910 and 1940 was virtually identical to the increase between 1970 and 2000. Yet the IPCC does not attribute the increase from 1910-1940 to 'human influence.' They are clear in their belief that human emissions impact only the increase since the mid-20th century. Why does the IPCC believe that a virtually identical increase in temperature after 1950 is caused mainly by 'human influence,' when it has no explanation for the nearly identical increase from 1910-1940?"
Moore went on to say: "Today, we live in an unusually cold period in the history of life on earth and there is no reason to believe that a warmer climate would be anything but beneficial for humans and the majority of other species. There is ample reason to believe that a sharp cooling of the climate would bring disastrous results for human civilization.
"It is 'extremely likely' that a warmer temperature than today's would be far better than a cooler one."