Its our fault. The weight of our overpopulated earth is causing the other planets to come out of alignment, hence their global warming. Also, our insistence on eating cows is causing to much methane gas which everyone knows will eventually reach Mars, thus hurting Martian atmosphere also.
Yep, humans fault.
Now the poor Martians will be forced to cannibalize one another.

(hopefully, no one took the above comments seriously)