There has been a lot of new science on climate change. By and large, it has been very much pushing in the direction of raising our level of alarm, raising the sense of urgency that we should have, and it is a fact that the IPCC fourth assessment report, third volume, which came out this year, did confirm those numbers that we ended up concluding, the numbers for the Canadian reductions that we think we need to see by 2020 and 2050, the numbers we put in our report. The IPCC has now confirmed that those are the right targets. In fact, they're at the bottom end of the range of the right targets for industrialized countries, if we want to have a chance of avoiding two degrees.
On December 11th, 2007. See this statement in context.