The Economist this week has a letter from a David Crawley of Hong Kong:

I agree with your view, in relation to the Stern report on climate change, that governments should act on “the risk of something really catastrophic” (“Stern warning”, November 4th). I propose investing in a space defence system to protect against alien invasion. Like the melting of Greenland's ice sheet, only a minority of scientists perceive this as a threat and the costs of such a defence are enormous, but if aliens were to invade it would also be a disaster.

I'd love to buy Mr Crawley a beer, preferably before we're invaded.

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