Some thoughts on Peak Oil
Nothing would happen to Ottawa, except maybe a higher population as people would be fleeing from the flooded areas.
As for peek oil, no one really knows how much oil there is on the planet, let alone try and guess how much is left, when the British First came to north america, fish could be caught by simply dipping a bucket in the water, but now... fish are now becoming rare, close to extinct, and theres more laws guarding them then fishermen these days.
Fish is a renewable resource, oil... is not, unless you care to wait a few million years for the dead matter to start returning to liquid form, by that time the world would probably be nothing more then a few islands that used to be mountains from global warming, Oil is almost very dangerous in the sense that we could run out at any time within the next 10-20 years, and because we cannot predict when it will run out, it will be an extreme and very sudden change that would effect everyones lifestyle.
As we all know, many people don't take well to change, let alone a sudden, semi-unexpected change, people dependent upon the way we live our lives now will become the most dangerous, that is if they cant adapt. The world has become far to dependent on oil and the end of it may end everything else as well, the slow development of alternative energy sources needs to pick up, and the prices of the existing alternative energy sources (ex: Solar) need to drop.
If it isn't the USA having another civil war and the middle east going mad, the third world war will most likely be a result of the need for oil.