http://www2.ucar.edu/atmosnews/just-published/122687/2-degree-goal-and-question-geoengineering#.V9BIVNnJZec.twitter
"The new study examined a scenario in which emissions continue growing at
current rates until about 2040, when warming would reach 2 degrees. The authors
found that, even if society then adopted an aggressive approach to reducing
emissions and was able to begin drawing down carbon dioxide from the
atmosphere, warming would reach 3 degrees by the end of the century.
So they explored an additional possibility: injecting sulfate particles, like
those emitted during volcanic eruptions, into the stratosphere. This approach
to geoengineering, which is untested but has generated discussion for several
years, would theoretically counter global warming because the sulfates would
block incoming sunlight and shade the planet. This is why large volcanic
eruptions can have a planet-cooling effect.
The research team estimated that society would need to keep injecting sulfates
for 160 years to stay within the target of 2 degrees. This would require a peak
rate of 18 megatons of sulfur dioxide per year, or about 1.5 times the amount
emitted by the massive eruption of Mt. Pinatubo in 1992.
Even so, the climate would be noticeably altered under this scenario. Extreme
hot days with geoengineering would be about twice as frequent in North America
and other regions compared to present-day conditions. (In comparison, they
would be about five to six times more frequent without geoengineering.)
Summertime Arctic sea ice would retreat significantly with geoengineering,
whereas it would disappear altogether if society relied solely on
reducingcarbon dioxide in the atmosphere after 2040. Precipitation patterns
would also change with geoengineering, causing drying in some regions."
GR Translation - The Anthropocene won't be ending any time soon under current
emissions trajectories ('till 2040), even with CDR and SRM deployed thereafter
(?) Hold the wake now, hope the authors are wrong, or hope that human behavior
suddenly changes?
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