In the documents that the government has published, there is reference surrounding the government's 2020 target for Canada's emissions. There is reference to preliminary economic analysis, but there are very few details given. I think it's a very interesting question to see whether the government would like to table, publicly, an economic analysis that explains to us why 20% below 2006 by 2020 is the correct target, why that particular target was chosen, and why we couldn't do more, because I haven't seen any such analysis.
On December 11th, 2007. See this statement in context.