I think that:

1. It is really too late to turn this ship around. We're probably in "runaway" climate change now, by what most of the research is showing.
2. Even if we could turn the ship around, we wouldn't.

So I just try to keep my hands reasonably clean and figure out ways that I can mitigate the effects of climate change in my own life -- choosing carefully where I live, living simply, avoiding more debts, learning some practical skills, and most of all -- being stoic when possible.