Most people in either region are not making any significant effort. They just live their lives like everyone else around them. The difference is in what that looks like.
Anyway, what's with this dichotomy "corporations should change behavior" vs. "consumers should change behavior"? Those two interact and influence each other. Obviously, both must change their behavior. This is a process that must be bootstrapped.
That's definitely true and top-down regulation is important so the whole economy has to clean up its act and it's not a competitive disadvantage for any one company to do it.
However, I don't like this frequently repeated claim that "it's actually big companies that are polluting!". They're polluting on our behalf, that's not an excuse.
It is more along the lines of "I can't do much personally against big companies". In the same way that you can't just "personally" create a better public transport system instead of driving.
And big oil & friends are massively lobbying to keep it just the way it is. It's easy to buy a senator, in same cases 10k are all you need to get his support.
Edit: Since the maximum nesting was reached. I will leave it at saying that "A party system is twice as good as a one party system".
