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How important is CO2 to planetary habitability?

How important is CO2 to planetary habitability?

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Surface temperature vs. pressure<br />

<strong>CO2</strong> CLOUDS IN BOTH CASES<br />

RED = DRY (PURE <strong>CO2</strong>)<br />

BLUE = H2O-SATURATED<br />

TROPOSPHERE, NO H2O CLOUDS<br />

Multiple-bar<br />

atmospheres unlikely<br />

due <strong>to</strong> constraints<br />

from atmospheric<br />

escape theory (e.g.<br />

Grott et al. 2011)

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