Cut down the rain forests:

Keppler and his colleagues discovered that living plants emit 10 to 100 times more methane than dead plants.

Scientists had previously thought that plants could only emit methane in the absence of oxygen.

David Lowe, of the National Institute of Water and Atmospheric Research in New Zealand, said the findings are startling and controversial.

"Keppler and colleagues' finding helps to account for observations from space of incredibly large plumes of methane above tropical forests," he said in a commentary on the research.

But the study also poses questions, such as how such a potentially large source of methane could have been overlooked...

Hey, I can answer that one--maybe because we haven't come up with a way to blame it on the rapacious, capitalist, resource-scarfing western world.

Seriously, it really is amazing, given that living animals definitely emit a lot more methane than dead ones (particularly after a Mexican meal).

Ronald Reagan was right. Trees do cause pollution. Remember the sign placed on a tree in protest: "Chop me before I kill again."