The reason we're doing that is that if we can significantly reduce those, we can buy ourselves time on the GHGs, which are the long-lived climate pollutants and forces, which take generations. It's been estimated that fully a third of global warming, on an annual basis, could be eliminated if we were to contain short-lived climate pollutants.
Evidence of meeting #53 for Environment and Sustainable Development in the 41st Parliament, 1st Session. (The original version is on Parliament’s site, as are the minutes.) The winning word was regulatory.
A recording is available from Parliament.