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(B) The greenhouse effect is a natural process that warms the Earth's surface. When the Sun's energy reaches the Earth's atmosphere,some of it is refl

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(B) The greenhouse effect is a natural process that warms the Earth's surface. When the Sun's energy reaches the Earth's atmosphere,some of it is reflected back to space and the rest is absorbed and re-radiated by greenhouse gases. Without this natural greenhouse effect,the heat would escape into space,and the Earth's average surface temperature would be approximately $-18^{\circ} C$,rather than the current average of $15^{\circ} C$.

If there is no greenhouse effect,the average temperature at the surface of the Earth would have been: (in $^{\circ} C$)

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