I cited evidence as to how we can get the kinds of deep reductions we need at little economic cost. The IPCC has done one globally. We've done modelling for 2020, and there is modelling for 2050.
All of it shows that we can get serious, deep emission reductions with virtually no impact on the economy. I cited the study we did where we would have economic growth in Canada at 26% instead of 27% between now and 2020.
You can turn that around and ask about the costs of not acting, and you start--