The warming of other solar bodies has been seized upon by climate sceptics; but oh how wrong they are, says Oliver Morton.
If the shooting of fish in barrels offends you, look away. The publication this week of a Nature paper on global warming on Mars offers a fantastic opportunity to kill off one of the silliest climate-sceptic arguments, and I'm more than happy to be pointing the gun at the water.
The sceptical 'argument' — using the word loosely — in question is that global warming on Earth should be seen as a natural, as opposed to anthropogenic, phenomenon because other planets and moons in the Solar System are getting warmer, too (which, indeed, they are). Since what the planets have in common is the Sun, they say, it must thus be the Sun that is driving the warming.