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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Carbon dioxide defines the outer edge<br />
of the classical <strong>habitability</strong> zone<br />
• Kasting (1993):<br />
Habitability means<br />
surface liquid water<br />
• Inner edge = runaway<br />
H 2 O greenhouse, outer<br />
edge = max. possible CO 2<br />
greenhouse<br />
• Even for pure CO 2<br />
atmospheres,<br />
uncertainties pers<strong>is</strong>t!<br />
b c<br />
VENUS EARTH MARS<br />
d<br />
Sels<strong>is</strong> et al. 2007, Astronomy & Astrophysics<br />
http://www.webmastergrade.com/wp-content/uploads/2010/08/Ocean-View.jpg
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