They left out an important word ("suddenly"), leaving them with a false
sentence.
Methods that aim to deliberately alter the climate system to counter
climate change, termed geoengineering, have been proposed. Limited evidence
precludes a comprehensive quantitative assessment of both Solar Radiation
Management (SRM) and Carbon Dioxide Removal (CDR) and their impact on the
climate system. CDR methods have biogeochemical and technological
limitations to their potential on a global scale. There is insufficient
knowledge to quantify how much CO2 emissions could be partially offset by
CDR on a century timescale. Modelling indicates that SRM methods, if
realizable, have the potential to substantially offset a global temperature
rise, but they would also modify the global water cycle, and would not
reduce ocean acidification. If SRM were terminated *suddenly *for any
reason, there is high confidence that global surface temperatures would
rise very rapidly to values consistent with the greenhouse gas forcing. CDR
and SRM methods carry side effects and long-term consequences on a global
scale. {6.5, 7.7} (p. 21)
Unfortunately, that sentence is false as written. If SRM were terminated
with a slow phase out, surface temperatures would not rise very rapidly.
_______________
Ken Caldeira
Carnegie Institution for Science
Dept of Global Ecology
260 Panama Street, Stanford, CA 94305 USA
+1 650 704 7212 [email protected]
http://dge.stanford.edu/labs/caldeiralab
https://twitter.com/KenCaldeira
On Fri, Sep 27, 2013 at 1:57 PM, Josh Horton <[email protected]>wrote:
> It's finally out and here's what it says about geoengineering:
>
>
> http://www.climatechange2013.org/images/uploads/WGIAR5-SPM_Approved27Sep2013.pdf
>
> Methods that aim to deliberately alter the climate system to counter
> climate change, termed geoengineering, have been proposed. Limited evidence
> precludes a comprehensive quantitative assessment of both Solar Radiation
> Management (SRM) and Carbon Dioxide Removal (CDR) and their impact on the
> climate system. CDR methods have biogeochemical and technological
> limitations to their potential on a global scale. There is insufficient
> knowledge to quantify how much CO2 emissions could be partially offset by
> CDR on a century timescale. Modelling indicates that SRM methods, if
> realizable, have the potential to substantially offset a global temperature
> rise, but they would also modify the global water cycle, and would not
> reduce ocean acidification. If SRM were terminated for any reason, there is
> high
> confidence that global surface temperatures would rise very rapidly to
> values consistent with the greenhouse gas forcing. CDR and SRM methods
> carry side effects and long-term consequences on a global scale. {6.5, 7.7}
> (p. 21)
> Not quite what the Guardian was reporting last week ...
>
> Josh
>
>
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