Solar luminosity is estimated to have been 30% lower than today at the time when the solar system… 1 answer below »

Solar luminosity is estimated to have been 30% lower than today at the time when the solar system formed, 4.6 billion years ago a. If Earth's albedo was the same as it is now (A = 0.3) , what would have been its effective radiating temperature at that time? b. If the magnitude of the greenhouse effect had also re­ mained unchanged (LiTg = 33 K) , what would Earth's average surface temperature have been? How does this compare with today's value?

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