Tad Homer-Dixon is a rare kind of public intellectual, who combines real expertise with a commitment to communicate to the widest possible readership. In The Ingenuity Gap he wants us all to wake-up to the fearful possibility that our blithe trust in science and technology may be misplaced. Human ingenuity may not be capable of coping with two emerging crises of this century and the next: population growth and environmental despoliation. Read Homer Dixon's wake-up call and you will see the future very differently.

I'm very struck by what you can do in a classroom. I've got 200 students. You don't do partisan politics in a classroom, that's not appropriate. But you want to give them a strong sense that these are the issues that matter.

I teach students that what people say about failure in politics is mostly wrong. People always told me, 'They'll praise you on your way up and kick you on your way down.' That wasn't my experience. I can't walk down the street in Toronto without someone coming up and saying hello.

No kid graduating in a political science class in Canada should not understand what's happened to income inequality since the 1970s, period. And then, what do we do about it? It's the biggest problem out there, in all western liberal societies.

I distinguish, between nationalism and patriotism.

What really matters is getting new people in. The constitutional changes matter, but the thing that the party mustn't do is turn in on itself and think the thing we've got to do is fix our plumbing. The thing we've got to do is get new people in.

There's intense national feeling in America that could be called patriotism.