Climate Change Hits Mars

NASA Scientists are saying that Mars has warmed by over 0.5C since the 1970's, a similar change to the warming we have experienced here on Earth over the same period. Now I ask you, what force could possibly effect both planets and change their climates in a similar manner? (Hint: There's a picture of it to the right)

I am pretty sure that little rover we have running around on Mars isn't causing "man-made" global warming up there. So, to compare, we have similar changes in climate between here and Mars (an uninhabited planet) and I believe we have to ask if maybe our warming trend has more to do with outside sources rather than animal gas and SUV's. People seem to keep ignoring the fact that we have a rather insignificant impact on the CO2 levels here on Earth.

How long do you think it will be before environmentalist nuts start saying there must be civilizations on Mars (out of sight) that are causing their warming trend? Even better, I bet they'll probably find some way to blame it on us, the average American...again.