Mars' atmosphere is mostly carbon- dioxide. Why does it not experience a runaway greenhouse effect like Venus?

Question

Quizplus · Accepted Answer

Mars' atmosphere is too thin to experience a runaway greenhouse effect like Venus. The atmospheric pressure on Mars is only about 1% that of Earth's, and hence the greenhouse gases cannot trap enough heat to cause a runaway effect. Additionally, Mars lost its magnetic field early in its history, and hence is not protected from the solar wind and ionizing radiation that can strip its atmosphere. The lack of additional water is not a significant factor in this context.

Mars' Atmosphere Is Mostly Carbon- Dioxide