Nor is there any law against buying fruit juice that smells like blue cheese, if that's what people want to do with their money.

FORBES: Tale of the South Pacific

And research shows that when the incomes of poor families rise, parents spend the gains on improving the diets of their children through buying fresh fruit.

BBC: Poorer children more likely to be obese, says Anna Soubry

Yet while most people have read of the threat of rising sea levels and melting polar caps, or experienced a nagging guilt when booking a cheap flight or buying exotic fruit imported from the other side of the planet, hitherto global warming has largely been something we are happy to leave to the scientists to worry about.

CNN: Six degrees of devastation

All European countries have stopped buying from Spain, says the head of the fruit and vegetable exporters' association.

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