That is why today's environmental problems in the poor countries ought, in principle, to be solvable.

因此，原则上当今贫穷国家的环境问题应该是能够解决的。

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"I am not opposed as a matter of principle to agro-fuels," he said. "Although, I think their environmental benefits in many cases have been widely overestimated."

从原则上讲，我并不反对利用农作物生产燃料，尽管我认为，在很多情况下，生物燃料在环保方面的好处被大大夸张了。

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The European model rests more on the "precautionary principle", which underpins most environmental and health directives.

欧洲的典范却过多地依赖于其订立的“预防制度”，而这种制度强调最多的仅是环境与健康方面的指示。

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This principle has gained fame (and an equal measure of notoriety) in the last few years and is now a guiding principle in environmental policy and decision making with the United Nations and many countries around the world.

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While the precautionary principle enjoys considerable support from environmental activists, politicians, and indeed, some scientists, as a law, it is inherently vague.

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In principle, there are three ways of limiting human environmental impacts: through population policy, technology and governance.

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