If the Earth's atmosphere did not contain greenhouse gases, then the average surface temperature required to balance the non-reflected solar radiation would be about

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Without greenhouse gases, the Earth's average surface temperature would balance at about -19°C. This is because the Earth would radiate energy back out into space, but would not have any mechanism (such as greenhouse gases) to trap some of that energy and keep the planet warmer. This balance temperature is sometimes called the "effective temperature" or "radiative equilibrium temperature."

If the Earth's Atmosphere Did Not Contain Greenhouse Gases, Then