Why is Mars' greenhouse effect negligible compared to that of Earth?
A. The Martian atmosphere is much thinner and retains little heat.
B. Martian carbon dioxide contains a rare isotope with little ability to trap heat.
C. Its mass is only one-ninth of Earth's.
D. Greenhouse gas emissions were greatly curtailed according to the International Mars Greenhouse Gas Reduction Treaty of 2003.
Answer: A
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