Honest answer - I only vote for candidates that take this issue deadly seriously, and that's about it.

No amount of my meager donations or subtle lifestyle changes (I'm already a lifelong carless urban dweller with a low footprint by Western standards) will accomplish what can only be accomplished by multi-trillion dollar government investment, hardcore and wildly disruptive government regulation, and aggressive diplomatic efforts. Only governments can truly make a dent and I do what I can to elect government officials who will do what needs to be done.