COFFEE-LOVERS be warned. Whether you are a three-double-espressos-a-day addict or just indulge in the occasional cappuccino, enjoy it while you can: a coffee drought may be on its way. Changing climate threatens to reduce the flow of coffee that fills 1.6 billion cups a day to a trickle. It may not be long before that after-dinner espresso costs more than the wine and some caffeine addicts will be forced to go cold turkey.

If that prospect fills you with dread, you are not alone. There are some 26 million farmers who depend on coffee to feed their families. Coffee is the most valuable tropical export crop, and as the world’s favourite drink it is big business. Our seemingly insatiable appetite for macchiatos and lattes has made coffee the second most traded commodity after oil, with exports worth a whopping …

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