Most biofuels are at best carbon neutral, emitting as much carbon dioxide when they're produced and burned as the biofuel crops take in as they grow.

大多数生物燃料顶多达到碳平衡，即他们生长时吸收的二氧化碳与被制成生物燃料和燃烧后释放的二氧化碳等量。

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"I just drank a little bit, but it burned my throat and my mouth, " said Zhao, who tends the crops, cares for her two boys, now 5 and 10, and runs a household of seven.

“我刚刚喝了一点点，但农药象是把嘴和喉咙烧着了，”赵说。 这个普通农妇除了要耕种庄稼、照顾丈夫和两个男孩（一个5岁，另一个10岁）以外，还得维持一个7口之家的日常生活。

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In 1998 their house burned down. This year they have lost most of their corn and wheat crops because of bad weather.

1998年，他们的房子被大火烧毁了，因为今年天气不好，他们损失了大部分的玉米和小麦收成。

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They burned crops. They destroyed stores and factories.

VOA: special.2009.12.03

Farms were burned. Crops were destroyed.

VOA: special.2009.12.03

But one-fifth of all greenhouse gases comes from forests that are cut down and burned to make way for crops or pasture.

NPR: Paying Developing Countries Not to Burn Forests