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Do high levels of CO2 in the past contradict the warming effect of CO2?

Do high levels of CO2 in the past contradict the warming effect of CO2?
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Bad Astronomy | Chance played a role in keeping Earth habitable for billions of years

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Artwork depicting the last day of the Cretaceous Period. Credit: Davide Bonadonna via Imperial College London
That s also weird. We know that stars like the Sun grow hotter as they age, and that long ago the Sun was about 30% fainter. That either means the ancient Earth should have been frozen solid, or, assuming it was clement, the Earth should be boiling hot now. Neither is true, which is a mystery.
This is called the Faint Young Sun Paradox, and has prompted many scientists to presume that the Earth has a kind of thermostat, a set of conditions that tend to rebalance a system that gets out of whack so it doesn t get too hot or too cold. This would be a negative feedback system, where if a condition arises to, say, heat up the Earth, things will change in a way to cool it back down. ....

Davide Bonadonna , Kate Davis , Imperial College London Davide Bonadonna , Imperial College London , Faint Young Sun Paradox , கேட் டேவிஸ் , ஏகாதிபத்தியம் கல்லூரி லண்டன் , மயக்கம் இளம் சூரியன் முரண்பாடு ,