Pollution from chemical sources such as factories can cause the death of whole ecosystems very quickly.

工厂里排放出来的化学品造成的污染会让整个生态系统迅速崩溃。

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This chemical pollution has two sources: the factories which dump polluted water directly into the river and the local community which dumps untreated human wastes into the river.

这种化学污染有两个来源：直接把污水倒进河里的工厂，和把未经处理的人类垃圾倒进河里的本地社区。

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But the oil price hike has also fueled a race to find new sources for chemical intermediates - compounds that are the raw material for many modern plastics, drugs and fuels.

但是，高涨的油价还激发了寻找新的化学中间品来源的竞争——这些化合物是许多现代材料的原料，比如塑料、药品以及燃料等等。

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No indication of power, energy, flow, how thoroughly he investigated for chemical sources.

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But environmental agencies want the amount reduced even more on the reasoning that people might get a higher cumulative exposure to the chemical from other sources.

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Relevant factors for comprehensive socio-economic risk assessments for ocean acidification impacts will be identified, including interaction effects with other physical, chemical and human sources of ecological stress.

UNESCO: Social and Human Sciences