美国具有丰富的矿产资源和肥沃的农田，气候温和适中。
The United States is a land rich in mineral resources and fertile farm soil, together with a moderate climate.
专家们表示，粮价上涨的部分原因是气候的变化，另一个原因是过去被用来种庄稼的农田现在被用来种植生产洁净的生物燃料的作物。
Experts say the rising food prices are partly due to climate change - and because fields once used to grow food crops are now used to cultivate crops for cleaner-burning biofuels.
图中为云南，一农民艰苦跋涉于受旱灾的农田间。严重的旱情导致对农作物物价上涨、气候变化和跨界用水管理的不安。
A farmer treks through arid farm fields in Yunnan amid a devastating drought that raised unease about food prices, climate change and cross-border water management.
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