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.

An intellectual may be interested in ideas and policies for their own sake, but a politician's interest is exclusively in the question of whether an idea's time has come.

Genocide is not just a murderous madness; it is, more deeply, a politics that promises a utopia beyond politics - one people, one land, one truth, the end of difference. Since genocide is a form of political utopia, it remains an enduring temptation in any multiethnic and multicultural society in crisis.

Cynics who say power is all that counts in politics forget that power without ideas is just improvisation.

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.

We must not lose sight of the fundamental issue of policy which is that people who come to the country on visa status must never be abused.

Liberals don't want any part of Canada left behind. I used to give speeches on and on and on about the fact that we don't want to have a country where you think, "my kids have got to move to the city if they're going to have any kind of future." We've been saying that, and we've not got through.