他们的政策对环境没有不利的影响。
人对环境的不利影响不单单是该范围内有多少人来决定的，而是取决于我们消耗了多少物品以及我们占用了多少空间。
The impact of humanity on the environment is not determined solely by how many of us are around, but by how much stuff we use and how much room we take up.
然而许多地区的产量在下降，因为杀虫剂成本高昂以及对环境的不利影响，病虫害问题无法应对。
However production is in decline in many regions as a result of pest and disease problems that cannot be managed due to the high cost of pesticides and their negative environmental effects.
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