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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