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Selects: Carl Sagan: American Hero
Stuff You Should Know
Is There a Greenhouse Effect on Earth?
Earth definitely does have a greenhouse effect, and it's problematic. Another one that is wide cited for is the faint on young sun paradox. Back then, when earth was mostly a frozen ball of ice, the sun was only like 70 % of its luminosity. And so it doesn't make sense that there should be any liquid water on earth.
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