New Scientist is carrying this update to the developing controversy over Martian methane. One group of scientists has found the methane is concentrated in certain areas on the planet, implying it's being destroyed before the Martian wind can disperse it over the planet. Another group is taking the position there's no methane at all on Mars, and even if there is they've come up with a way of explaining it that involves only geological processes.

Ain't planetary science fun?