Could geoengineering reverse climate change?

An engineer at Harvard says we could start to reverse climate change in 15 years at a cost of about $2 billion per year. Holman Jenkins of the WSJ (Feb. 2020) says the Jeff Bezos should consider funding the project.

Questions: Can government bureaucrats anticipate all the possible innovations that may help fight climate change? If not, how can they figure out the best way to combat climate change?