AP Environmental Sciencemediummcq1 pt
Without greenhouse gases, Earth's average temperature would be about
A.−18 °C
B.15 °C
C.0 °C
D.50 °C
Explanation
Core Concept
The natural greenhouse effect lifts the planet from a frozen −18 °C to today's ~15 °C — the effect itself is life-sustaining; the problem is its enhancement.
Correct Answer
A−18 °C
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