It remains the case that nearly all "deniers" reached that point of view for political reasons, and nearly all ardent worriers/protesters did the same.
It also remains the case that CO2 levels are going to continue to rise for some time, decades probably, no matter how many agreements are signed. The math is pretty clear on that one, barring another major drop in economic activity. You can't just sign agreements and throw money at a problem and expect any results.