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|a Target Atmospheric CO2 |h [electronic resource] |b Where Should Humanity Aim?. |
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|a Please contact the owning institution for licensing and permissions. It is the user's responsibility to ensure use does not violate any third party rights. |
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|a Paleoclimate data show that climate sensitivity is ~3°C for doubled CO2, including only fast
feedback processes. Equilibrium sensitivity, including slower surface albedo feedbacks, is
~6°C for doubled CO2 for the range of climate states between glacial conditions and icefree
Antarctica. Decreasing CO2 was the main cause of a cooling trend that began 50
million years ago, large scale glaciation occurring when CO2 fell to 425±75 ppm, a level
that will be exceeded within decades, barring prompt policy changes. If humanity wishes to
preserve a planet similar to that on which civilization developed and to which life on Earth
is adapted, paleoclimate evidence and ongoing climate change suggest that CO2 will need to
be reduced from its current 385 ppm to at most 350 ppm. The largest uncertainty in the
target arises from possible changes of non-CO2 forcings. An initial 350 ppm CO2 target
may be achievable by phasing out coal use except where CO2 is captured and adopting
agricultural and forestry practices that sequester carbon. If the present overshoot of this
target CO2 is not brief, there is a possibility of seeding irreversible catastrophic effects. |
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|a Electronic reproduction. |c Florida International University, |d 2015. |f (dpSobek) |n Mode of access: World Wide Web. |n System requirements: Internet connectivity; Web browser software. |
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|a Valerie Masson-Delmotte. |
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|a dpSobek |c Sea Level Rise |
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|u http://dpanther.fiu.edu/dpService/dpPurlService/purl/FI15060329/00001 |y Click here for full text |
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|a http://dpanther.fiu.edu/sobek/content/FI/15/06/03/29/00001/Hansen et al_2008_Target atmospheric CO2thm.jpg |
