Sure. At a general level, of course, there are jurisdictional constraints flowing from the Constitution with respect to how far the federal government can go. It has only so many constitutionally based levers to pull, and the present government has been using almost all levers available.
That does not get the country all the way to achieving the emissions reductions required. It will go a significant way, but not all the way, so there is no option other than to co-operate with provinces, and across provinces and territories.
The specific change I'd suggest to the bill is moving the permissive portion of subclause 10(3) up to the mandatory portion of subclause 10(1). To get away from the numbers and technical—