"Phil Christensen, a planetary scientist at Arizona State, cautions against over-extrapolating from the data, however. He told Nature.com that it is unlikely that in 500 years time the Martian ice caps would be completely gone:

"They're looking at a piece of the cycle, other processes could turn this around to a place where the ice-caps start growing again. You can't take 10 years of data and extrapolate out to 1,000 years.""

Mr Christensen should tell this to his fellow earth climate scientists then....