Coppicing is sustainable and doesn't threaten the environment.

矮林作业是可持续的，不会对环境构成威胁。

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But the fertilisers are expensive, can threaten the environment themselves and also cause the soil to harden and become less fertile.

但是化肥很贵，而且本身可能威胁环境，而且还导致了土壤硬化和肥力下降。

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Much of those gases are sealed in refrigerators and air conditioners, where they do not threaten the environment.

很多这种气体被密封在冰箱和空调器里面，在这里它们并不威胁环境。

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Although corruption, rural poverty and damage to the environment threaten this, party leaders are still more concerned about the danger of unemployment.

ECONOMIST: China

But the Democratic leadership wants to keep the ban in place, arguing that more offshore drilling will have little effect on prices and could threaten the environment.

CNN: GOP lawmakers want special session on energy crisis

We will seek reauthorization and expanded funding for the Superfund program to continue cleaning up hazardous waste sites which threaten human health and the environment.

CNN: State of the Union Address