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Here's a slide presentation from an Astrophysics course from the University of Florida. Slide 6 shows what the temperatures of Venus, Earth, and Mars are, and what they'd be without greenhouse warming.


http://www.astro.ufl.edu/~skane/teaching/ast2037/A2037_Lect16.pdf


Venus would actually be much colder since its dense atmosphere would reflect so much of the solar radiation back into space.

Earth would be colder--an average minus 17 degrees Celcius instead of our 15degrees.

Mars would be a little colder but not much because its atmosphere is so thin.


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