I think if "we" collectively really really believe CC was a looming crisis and we HAD to do something drastic NOW, we'd be behaving much differently. Obviously, countries would be pushing wind and solar, fine, carry on, but that won't get us "there" fast enough.
The ONLY currently available technology is nuclear, and oddly enough countries aside from France are moving away from that as an option. (There is noise in France of course, but nothing realistic.) It would be technically possible to replace every coal fired plant in the US with nuclear in a decade. And yes, it would be costly. Every nuclear plant seems to have horrendous cost overruns (Vogtle). Perhaps that could be mitigated by using a standardized design as they do in France.
That step would put a significant dent in our carbon output, it would not solve the problem of course, we'd still have NG plants, and transportation, but it would be a nice dent.