I've been following the comments and see that most of them deal with the regional differences and the various parties' approach to climate change.
My concern is more constitutional and I'm very much on board with the minority opinions of Côté, Brown and Rowe.
Like Côté, I believe that the legislation in itself is bad as it provides an unfettered power in the governor in council to vary the law in ways that would ordinarily require a return to parliament for legislative approval. These ways are far beyond the ordinary delegations that parliament gives to agencies through regulation making powers.
Over and above that I agree with Brown and Rowe, that there is a clear division of authority as between the federal and provincial governments as to the subject matter of regulating an industry within a province falls clearly and unquestionably within the domain of the provinces. That was accepted by all the judges, but the majority fell back on the catch-all "peace, order and good government" provisions of the Constitution in order to give the Feds an overriding power.
IMHO the issue is not one of such "national concern" that the POGG provisions should be attracted. One doesn't have to be a climate change denier to see that whatever actions the provincial or federal governments take, in the big picture, such actions are but a drop in the bucket when one considers the size of Canada and its contribution to greenhouse gas emissions in respect to the rest of the world's outputs.
The majority, in this case, have greatly extended the circumstances (which have been narrowly allowed by numerous court rulings in the past) within which the Feds will be granted POGG powers to override provincial authority. This should be a concern to all of us who consider this country a confederation of provinces rather than a monolith central power.