Do the math.
Let's not forget global warming on Pluto.
http://www.space.com/scienceastronomy/pluto_warming_021009.html
Not in the same sense that it is occurring on Earth.
"Thus inferring global warming from a 3 Martian year regional trend is unwarranted. The observed regional changes in south polar ice cover are almost certainly due to a regional climate transition, not a global phenomenon, and are demonstrably unrelated to external forcing. There is a slight irony in people rushing to claim that the glacier changes on Mars are a sure sign of global warming, while not being swayed by the much more persuasive analogous phenomena here on Earth..."