Yep, even if we (humans) started doing everything right today, we'll still be deteriorating for years. That is my very limited understanding.
Canadians might not lead the way on deaths by starvation in the coming years, but we are all on this ball together. It is our duty to act to prevent this disaster, and as a relatively young and relatively wealthy nation I would say our proportion of that duty should be greater than simply our percentage of causing it.