It literally says 8C average surface warming globally in the abstract, just a few sentences in:
"In addition to the warming from rising CO2 levels, this instability triggers a surface warming of about 8 K globally and 10 K in the subtropics. Once the stratocumulus decks have broken up, they only re-form once CO2 concentrations drop substantially below the level at which the instability first occurred."
edit: There are also a tremendous amount of problems with all proposed geoengineering solutions. They are uniformly an emergency backup, not something we should ever choose.
The most realistic option, sulfur dioxide in the stratosphere, needs to be maintained continually to avoid a sudden onset of warming. It also does nothing for ocean acidification from CO2 or the cognitive problems higher concentrations cause.
Thinking that we can just tech-magic our way out of this is very dangerous. This will require hard choices. It would have been 100 times easier if we just started 30 years ago, but it will be 100 times harder if we wait another 10.
"In addition to the warming from rising CO2 levels, this instability triggers a surface warming of about 8 K globally and 10 K in the subtropics. Once the stratocumulus decks have broken up, they only re-form once CO2 concentrations drop substantially below the level at which the instability first occurred."
edit: There are also a tremendous amount of problems with all proposed geoengineering solutions. They are uniformly an emergency backup, not something we should ever choose.
The most realistic option, sulfur dioxide in the stratosphere, needs to be maintained continually to avoid a sudden onset of warming. It also does nothing for ocean acidification from CO2 or the cognitive problems higher concentrations cause.
Thinking that we can just tech-magic our way out of this is very dangerous. This will require hard choices. It would have been 100 times easier if we just started 30 years ago, but it will be 100 times harder if we wait another 10.