"We have altered the physical, chemical and biological properties of the planet on a geological scale..." — David Suzuki

Scientists generally are really chicken about getting involved in some kind of dispute. As a broadcaster, I find it very difficult to urge them, if it is a controversial subject. They don't want to have science being portrayed badly.

Environmentalism isn't a discipline or specialty. It's a way of seeing our place in the world. And we need everybody to see the world that way. Don't think 'In order to make a difference I have to become an environmentalist.'

Scientists have been warning about global warming for decades. It's too late to stop it now, but we can lessen its severity and impacts.

Do you know how much land is under ice, rock and snow? Do you know why 90 percent of us live within 100 kilometres of the U.S. border? We have this idea we're a vast country. But the reality is that a lot of it, a huge amount, is uninhabitable.