I think it's almost painfully simple as a policy wonk question, really. Taxes. The wealthy industrialized nations of the world must come together, hammer out

I think it's almost painfully simple as a policy wonk question, really. Taxes. The wealthy industrialized nations of the world must come together, hammer out a framework for cooperation, and set a price for carbon pollution that will be phased in, both internally within their economies, and most importantly, as trade tariffs that incentivize the developing industrial economies where so much of the carbon pollution our standard of living is responsible for actually is produced. I'm not sure on the ideal timeline but the taxes should start moderate and then gradually but steadily and painfully increase over a period of some time -- several decades, probably, until such point that energy derived from carbon-neutral sources is cheaper than energy derived from fossil fuels. Throw the revenue generated at a mix of poverty relief to offset the humanitarian consequences of the above policy (which would be enormous without careful handling), subsidize clean energy developments, and whatever else comes to mind to offset the negatives or assist the process. Doing this slowly and predictably is less of a shock treatment, and I do think this is an area where the market may well weave its "magic" given the appropriate incentives.