Opinion: Canada must continue cutting emissions regardless of the actions of other polluters

I have, over the years, lost count of the number of times I have seen or heard people say that it doesn't matter what Canada, or the more-developed world, does to reduce carbon emissions. It is argued that the main global problem is that major emitters such as China, India, Russia and Brazil continue full tilt for economic growth at any carbon-cost. Consequently, global emissions continue to grow, despite falling emissions in the West.