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Pollution, Climate and Conventions · Question 32 of 67

Question 32

HardOriginal question

Without its natural greenhouse effect, the Earth's average surface temperature, now about 15 °C, would be roughly

Options for question 32

Show the answer and explanation
CorrectNot quiteAnswer A

Correct answer: A

Explanation

  1. Calculations of the heat the Earth receives and gives off show it would average about −18 °C with no greenhouse gases.

  2. The natural greenhouse effect keeps it about 33 °C warmer, which allows liquid water and life.

Worth noting

Without greenhouse gases the Earth would be colder, not hotter; the gases trap heat.

Concept
The natural greenhouse effect
Typical time
90 s
Your time
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The rule this testsOzone layer and greenhouse effect
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