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Organic Coffee Threatened by Global Warming-Stoked Fungus

Teodomiro Melendres Ojeda, an organic coffee grower in Cajamarca, Peru, stands at a crossroads. Neither path is attractive.

Leaf-rust fungus, known as roya in Spanish, has devastated about a third of his crop. Melendres, 48, can use chemicals to kill it, though he risks forfeiting his organic certification and the 10 percent price premium it brings. Or he can preserve the certification and watch his plants die.