It must be because of all those SUV's that are up there.
Lets use global warming alarmist/ evolutionist thinking to solve this dilema which threatens the "science" of global warming.
It's simply because the man made Co2 produced by SUV's and oil refineries, etc. escaping into space from earth that is causing mars, the moon, and all the other planets in our solar system to heat up.
So, unless we buy carbon credits from polluting countries who somehow have carbon credits to sell, which must be brokered through Al Gore's carbon credit trading co., we are all going to die.
See? that wasn't hard! /s
No, it is because of the two Mars Rovers