...but "The mechanism at work on Mars appears, however, to be different from that on Earth."
So: Mars warms by the same amount as the Earth does, in the same amount of time, and it is not due to the sun. No! It's just a huge coincidence! Nothing to see here! Move along! Return to your tasks!
But you see, it has to be this way. It has to. Mars and Earth cannot experience similar amounts of warming in the same time frame for the same reason; that would be disastrous. It has to be a huge coincidence.
Why? Because if global warming (on Earth, that is) is due to the sun, there is nothing we can possibly do about it and climatologists won't get all kinds of grant money to study "global warming=man made=apocalypse". Climatologists stop being important people and politicians stop listening to them.
If it's not a coincidence, the climate scare industry (the "global warming=man made=apocalypse" industry, that is) is suddenly out of the spotlight. Suddenly the biggest lever that the environmental movement has ever managed to develop just...goes away. Stops working. Becomes a theory only supported by crackpots. (You know, the kind of thinking that leads some people to claim that Al Gore actually won in 2000.)
On the plus side, if it is the sun, Al Gore and John Edwards stop looking like such hypocrites. Look on the bright side, guys!