In a world of 7 billion humans, headed for 9 billion by 2050 and 12 billion by 2100, it would be an interesting debate regarding which constitutes the greatest existential threat to humanity: resource development or overpopulation. Interesting, but short.

Canadian eco screamers can wail and lament all day long about hypothetical, and perhaps even occasionally accurate climate change prognostications, but the approaching train coming at us from out of the tunnel is fuelled by our own "fruitfulness".

And there is no doubt about the population numbers, none at all. Short of an extinction event, those numbers are going to happen. "Deniers" need not apply.

Dealing with a  few centimeters of sea level rise will seem like a walk in the park.

The world will demand, and try to force, that nations like Canada and Australia must accept not a few million, but tens or even hundreds of millions of these global citizens.

What will we do? What should we do? What could we do?