“We have this integrated CO2 problem that you can’t do anything about very quickly. So if there’s pressure from the public to do something fast, my concern is that there will be no tools at hand other than stratospheric geoengineering. And if we start doing research at that point, I am concerned it’s too late, because with stratospheric geoengineering, you’re interfering with a highly complex system. I will add that there are a number of people who do not agree with this.
