We probably won't see an increase in biofuel use—I mean, they won't replace fossil fuels until we can find ways to produce them cheaply and quickly and with less cost to the environment.

我们可能不会看到生物燃料使用的增加——我的意思是，在我们找到方法以更低的成本、更快的速度和更少的环境成本生产它们之前，它们不会取代化石燃料。

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Geologists search for fuels and minerals, study natural hazards, and work to protect Earth's environment.

地质学家寻找地球上的燃料和矿藏、研究自然灾害并制订保护地球环境的措施。

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There are, however, concerns about the impact of a large increase in the use of bio-fuels on the environment and on food prices.

然而，很多人担心，大量的增加使用生物燃料会对环境和食物价格造成影响。

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President Obama says the Summit of the Americas yielded broad hemispheric agreement on the need to spur economic growth, confront security challenges like drug trafficking, promote alternative fuels, protect the environment, and ensure human rights.

VOA: standard.2009.04.19

Mark Carpenter, research fellow at Cranfield University's Chemical Safety, Fuels and Environment Group, said that hydrocarbon fuels were "a very good way of storing energy" but that linking the process to renewable energy was the only way to make it tenable.

BBC: Petrol from air: Will it make a difference?

He said the company had agreed to amend its proposals to use only "environmentally friendly" fuels approved by the Environment Agency and policed by the Port Authority.

BBC: Artist's impression of the proposed plant

Rampant population growth and changes to the environment caused by humans, including the burning of fossil fuels and the conversion of nearly 43% of the planet's land to farms or cities, threaten to cause an abrupt and unpredictable shift in the global ecosystem, 22 scientists from five countries said in their paper.

CNN: STORY HIGHLIGHTS