Ian Clark

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Dr. Ian Clark is a professor in the Department of Earth Sciences at the University of Ottawa. He is also director of G.G. Hatch Isotope Laboratories. His graduate work in isotope hydrogeology was at the University of Waterloo and the University of Paris.

In a letter dated March 22, 2004 to The Hill Times, Clark wrote:

That portion of the scientific community that attributes climate warming to CO2 relies on the hypothesis that increasing CO₂, which is in fact a minor greenhouse gas, triggers a much larger water vapour response to warm the atmosphere. This mechanism has never been tested scientifically beyond the mathematical models that predict extensive warming, and are confounded by the complexity of cloud formation - which has a cooling effect. [1]

In the documentary The Great Global Warming Swindle he argues that changes in global temperature correlate with solar activity, saying for instance, "Solar activity of the last hundred years, over the last several hundred years correlates very nicely on a decadal basis, with sea ice and artic temperatures."