the simple explanation

Mars has a “global warming” problem. NASA reported last September that the red planet's south polar ice cap has been shrinking for six years.

Last time I checked there was no anthropogenic release of carbon dioxide to cause a “greenhouse” effect. Could it be that the great ball of nuclear fusion in the sky that we collectively call the “sun” is causing Mars, (and Earth) to warm up? I guess it’s possible that the one object that represents 98% of the mass of the solar system and is responsible for all energy and heat and light on Earth and in our solar system, might have something to do with the global temperature. It’s possible that the ball of fire that is 1.3 million times bigger than earth and 98 million miles away, creating 5 million tons of pure energy every second by converting 700 million tons of hydrogen into helium through a nuclear fusion process at 27,000,000 degrees Fahrenheit might have SOMETHING to do with the earth getting 0.6 degrees warmer over the past 100 years.

Duke University scientists have asserted that "at least 10 to 30 percent of global warming measured during the past two decades may be due to increased solar output."

But it could be my Nissan.