In 30 seconds?
I think the biggest opportunity is to cut energy use in buildings in half, by 50%. The technology exists, the know-how exists, and we have a tremendous green building cluster, I should say, in Canada. We're renowned worldwide for that.
One of the biggest challenges, I think, is leadership. We see some leadership now, both from the industry and from government, but we need more leadership to make it happen. It's not in the technology, it's not in the know-how; it's actually us as Canadians making a commitment to moving forward and making real change on the ground.