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How important is CO2 to planetary habitability?

How important is CO2 to planetary habitability?

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CO 2 clouds (1D studies)<br />

• Kasting (1991): CO 2<br />

clouds will increase<br />

albedo, probably cool<br />

• Forget & Pierrehumbert<br />

(1997): CO 2 clouds will<br />

warm via IR scattering<br />

• Colaprete & Toon (2003):<br />

Yes, but warming effect<br />

small due <strong>to</strong> microphysics<br />

of cloud formation

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