Which Globe?

Further news on global warming.....

The globe has warmed by .5 degrees celsius since the 70s. And that globe has a name. We call it Mars.

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.
-Times Online

Now, what do Earth and Mars have in common that could account for similar trends in global warming? Perhaps the sun at the center of our solar system?

h/t: QandO via Jeff the Baptist