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3 answers

The greenhouse effect is the biggest cause, the higher temperature and CO2 causes that effect, and there is no plant life to reduce the CO2 gas levels.

2007-07-17 02:33:51 · answer #1 · answered by Steve C 7 · 0 0

The distance from the sun is a major problem.

2007-07-17 09:54:36 · answer #2 · answered by JOHNNIE B 7 · 0 0

Because of their distances from the sun.

2007-07-17 09:34:06 · answer #3 · answered by Anonymous · 0 0

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