Other inputs and fish density are also carefully limited to avoid compromising water quality or degrading the environment.

其他投入或鱼的密度也要小心严格的限制，以避免破坏水质或者污染环境。

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As a result, the body robs calcium from the skeleton in order to neutralize those excess acidic toxins to create a safer environment, but then resulting in a lower bone density.

因此，身体从骨骼中失去了钙离子，以消除这些多余的酸性毒素，以创造一个更加安全的环境，但从而降低骨质密度。

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Tourism is creating other problems for the local environment, too, including increased population density, over-dependence on wood as a fuel and construction source and the overgrazing and cutting of mountain slopes to feed livestock.

BBC: Everest's growing problem

Some New Orleans neighborhoods remind me of pre-1980 Greenwich Village, offering a charming urban environment without either the extortionate price tag or oppressive density.

FORBES: The Katrina Effect: Renaissance On The Mississippi