The way I see it Copenhagen couldn't get commitments from anyone and things have only gotten worse for Pro-GW side since then. It seems we're at least a decade away from legislation (assuming man-made GW is a valid theory) since no one is going to reshape their economy on "a maybe".
Given that I'd like to see two things.
1. Have the scientists turn back to the science and eliminate the measurement/methodology problems that have led to questions in the last 10 years.
2. Have the politicians and pundits turn their attention to funding and/or raising money for the literally millions of clean energy startups out there. Because the easiest fix here is energy entrepreneurialism. Space based Solar Power alone could fix this problem.
At least, that's what would happen in my perfect world