Paul Krugman would like to see space aliens attack Earth so that we’ll have to initiate a massive, economy-stimulating military build-up:

But wait– the Guardian doesn’t want that at all. And you’ll never guess what contentious environmental issue may be attracting the ire of superior intelligent life:

It may not rank as the most compelling reason to curb greenhouse gases, but reducing our emissions might just save humanity from a pre-emptive alien attack, scientists claim.

Watching from afar, extraterrestrial beings might view changes in Earth’s atmosphere as symptomatic of a civilisation growing out of control – and take drastic action to keep us from becoming a more serious threat, the researchers explain.

UPDATE: Allahpundit is funny.