need your help http://review.chicagobooth.edu/economics/2019/article/tax-could-save-world what do you recommend as a best policy? A Pigovian

need your help

http://review.chicagobooth.edu/economics/2019/article/tax-could-save-world

1. what do you recommend as a best policy?
2. A Pigovian carbon-emissions tax?
3. A cap-and-trade policy framework? Increased government regulations?
4. Nothing, since relative price changes in the fossil-fuel and alternative-energy markets will solve the problem, assuming one exists, eventually?