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段落1

This is Scientific American 60-Second Science. I'm Cynthia Graber. Got a minute?

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Here's a good news/bad news story.

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Scientists have been able to dramatically increase the yields for oil palm trees, a crop with a global market.

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Oil palms grow in the tropics, so that should mean more profit from less land, helping to protect tropical forests.

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Good news, right?

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But in an article in the journal Science, researchers show how the increased yield could in fact lead to even more tropical destruction.

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Because as the value of palm oil planting increases, farmers could want to plant on even greater tracts of land.

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Which is bad news.

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Also, a future increase in supply could eventually lead to a decrease in prices.

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So palm oil could out-compete, say, rapeseed oil from Canada.

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Which would lead to an even higher demand for palm oil.

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Which is worse news.

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In addition, current low yields and high production costs means oil palm is not planted much in Africa and South America.

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But higher yields could make oil palm attractive to planters in those regions, leading to even more tropical forest destruction.

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To prevent these developments, the researchers write that policy makers need to be aware of and plan for the unintended negative consequences of technical advances.

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Which would be good news.

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Thanks for the minute, for Scientific American 60-Second Science. I'm Cynthia Graber.

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