Causes of planet's heating believed to be different from those on Earth.
Global warming has hit Mars, but the shifting winds and swirling dust that scientists theorize power climate changes there bear no relation to the heat-trapping gases that concern the people of Earth. Scientists, say that average global ground temperatures on Mars have risen by more than 1.5 degrees Fahrenheit during the past two decades, while the surface air temperature has risen by a little more than a degree in the same period.
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