It's a big question. At Transport Canada we're spending a lot of time looking at it. The committee member is right; the transportation sector writ large is the second-largest source of greenhouse gas emissions in Canada, at about 25%.
We have seen in recent years advances in technology that are assessing economically feasible changes in transportation systems to reduce greenhouse gas emissions. We've seen it in passenger vehicles. Zero-emission vehicles are still a bit more expensive than internal combustion vehicles, but the gap is closing. The incentives are driving switchover. We're seeing opportunities in large commercial vehicles, particularly ones that actually work locally in a city and return to base, to use zero-emission battery electric technology and perhaps clean hydrogen technology. I think the tougher ones will be aviation, but even there we're seeing opportunities to reduce carbon emissions from aviation that didn't look feasible even a few years ago.
We're quite optimistic about the ability to drive through a series of initiatives. I think there are some out there on the street already, and there are some where the government is actively considering additional initiatives under the enhanced climate plan, to drive a fairly significant transition to a lower-carbon transportation system in Canada.