It almost certainly would be counterproductive in the extreme. That is to say, if you want to create a greener world—which I do—you need to turn brown companies green. You need to stop consuming fossil fuels and switch to a much cleaner energy mix. In Canada's case, that would be more nuclear.
Climate change is a huge challenge, but describing it as an existential threat is an excellent example—I won't use the word “hysterical”—of gross exaggeration that actually clouds clear thinking on the matter.