"Earth's own atmosphere is depleted of CO2. ... CO2 deficits in exoplanet atmospheres might mean the same."
"The presence of ozone and absence of carbon dioxide could mean a habitable, and even inhabited, planet."
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"Earth's own atmosphere is depleted of CO2. ... CO2 deficits in exoplanet atmospheres might mean the same."
"The presence of ozone and absence of carbon dioxide could mean a habitable, and even inhabited, planet."