POLITICS: Long haul flights responsible for global warming on Mars

My first question after reading this story was 'Mmmm, How will Gordon Brown tax us for this?' I refer to this story on the National Geographic. Evidence presented from NASA indicates that the ice caps of Mars are also melting. Of course, the obvious implications of such a discovery makes two scenarios possible...

1. Mars is awash with 4x4 cars, long haul flights and 3rd world countries burning fossil fuels in abundance.
2. The current global warming of Earth, like Mars is actually being created by changes in the Sun's temperature, not the hyperbole you are being fed by the likes of the BBC.

I know where I'm putting my bets...