Although yield is obviously important to farmers, even more crucial is hedging their bets against famine, spreading the risk by growing many crops, over many seasons, in many locations.

尽管产量显然对农民很重要，但对抗饥荒更关键的是别把赌注下在一种作物上，要通过在多个地方、多个季节里种植多种作物来分散风险。

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Biofuels from poor but sunny countries, where crops yield much more energy and costs are lower, tend to be both cheaper and more environmentally friendly.

ECONOMIST: Can biofuels save Europe, or the planet?