Landfill is the worst environmental option for waste produced in the UK as the methane it produces is a potent greenhouse gas – 21 times more potent than CO2.

对于环境保护来说，垃圾填埋法是最糟糕的垃圾处理方法。因为填埋后的垃圾会产生沼气——一种强有力的温室效应气体，二氧化碳效力的21倍。

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“They are a worthwhile option, when you have done everything else possible to reduce your emissions, ” said Dave Reay, an environmental scientist at Edinburgh University in the U.K.

“当你已经做了一切努力减少自己碳排放量的时候，碳信贷就是有价值的选择。” 英国爱丁堡大学环境科学家戴夫·雷伊说。

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The wholesale construction of new transmission corridors is not always the best option due to a combination of environmental, land-use, permit-granting and cost considerations.

新的输电走廊的大规模建设往往不是最佳的选择，因为要综合考虑环境、占地、审批和造价等因素。

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But the environmental waste expert concedes that for the time being, landfills are the only practical option.

VOA: standard.2010.08.05

So called rainbow proteins (a spin-off from work into bioluminescence), which change colour in response to particular compounds, are also an option for detecting environmental toxins, or the potential agents of terrorism.

BBC: The light fantastic: Harnessing Nature's glow

"One adaptation option for Africa is to keep her forests standing so that they provide essential environmental services such as carbon sinks, " she said.

BBC: Africa's burning charcoal problem