Mr. McGuinty, I think you'd find approximately the same kind of consensus among economists as to the efficiency of a carbon tax as you find among scientists with respect to the science of climate change. It's widely recognized that a carbon tax is the single most efficient way to address greenhouse gas emissions. And that's a function of the fact that it covers the entire range of fossil-fuel-consuming activities in an economy and allows the market to allocate those emissions reductions at the lowest possible cost.
On February 6th, 2007. See this statement in context.