How important is CO2 to planetary habitability?
How important is CO2 to planetary habitability?
How important is CO2 to planetary habitability?
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Hydrogen greenhouse warming I:<br />
Early Earth<br />
• Classical picture of Earth’s atmosphere in the<br />
Archean: N 2 -CO 2 -H 2 O, trace amounts of H 2 and CH 4<br />
• Constraints on CO 2 (e.g. Sheldon 2006) lead <strong>to</strong><br />
infamous Faint Young Sun paradox<br />
• <strong>How</strong>ever: recent hydrodynamic escape modelling<br />
(Tian et al. 2005)<br />
indicates H 2 levels could<br />
have been much higher<br />
(up <strong>to</strong> 0.3 v.m.r)<br />
• Could hydrogen have<br />
played a direct role in<br />
greenhouse warming?<br />
http://www.blc.arizona.edu/courses/schaffer/182/Archean.gif
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