"Scientists from Nasa say that Mars has warmed by about 0.5C since the 1970s. This is similar to the warming experienced on Earth over approximately the same period."
Now what would Mars and Earth have in common that relates to climatic change ? Could it be solar output variations causing global warming ?
Alos note this: The Martian atmosphere is 95.72% Carbon Dioxide.
Mull over the implications... maybe the science isn't so settled.