A number of news sources are reporting that Ontario is starting a competitive bidding process for a new nuclear reactor. The seriousness of climate change does compel us to at least consider nuclear as an option, though it is entirely possible that the non-climatic risks involved may rule it out as a good idea.
In any case, one line in one article jumped out at me:
Construction would begin within the next decade.
Recently constructed nuclear plants have tended to face significant delays before and during construction, on account of both construction problems and legal challenges. The overall timeline shows just how challenging it will be to achieve significant emission cuts before 2020 by rejigging large emitters. Hitting 2020 levels of 25-40% below 1990 levels is vital if developed states are to get on the path to deep cuts by 2050 and stabilization in the 450 to 550 ppm range.