From a (typically excellent) NPR science story, this one about Ken Caldeira, the Stanford researcher into ocean acidification:
"Decades ago, everybody was smoking cigarettes — and it was acceptable to smoke cigarettes indoors," [Caldeira] says. "And there was a phase change in social acceptability, where it is no longer acceptable to dump your cigarette smoke in air that somebody else is going to breathe. And I think we can achieve the same thing with carbon dioxide emissions, where it just becomes socially unacceptable to dump your industrial waste into the atmosphere."
Kit Stolz 