I think depopulation is the best answer to global warming, but it has serious issues for economies.

Fewer births translates into an aging population. Now you have fewer young people doing the business of the nation and more old people requiring support.

To put the icing on top, now the tax base is shrunken. So how do we support the elderly? Hell, how to we provide any social safety nets?

Taxing the wealthy is a huge part of the solution, but it's not the panacea many on here make it out to be. Fortunes rise and fall, not a stable thing to base economic policy on, that requires a predictable tax base. We still need workers, and many jobs are "youth only". How many old garbage men do you see?