We Have Learned In Class And From The Readings That The Natural Greenhouse Effec

We have learned in class, and from the readings, that the natural greenhouse effect keeps the Earth warm. 

What temperature would the Earth be without CO2?

Select one:

a. 18ºC

b. 16ºC

c. 0ºC

d. -30ºC

e. -18ºC

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