A complicated mix of costs, technology and environmental issues means no one source is best.

一个复杂的混合成本，技术以及环境问题意味着没有一种能源是最好的。

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Hydropower plays a significant role in the energy mix of the United States and several other countries, but environmental concerns about the damage caused by DAMS have severely limited its growth.

水电在美国和其它一些国家的能源结构中占有显著的地位，但水坝对环境造成损害的问题已经严重地限制了它的增长。

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The Baltic Sea's unusual mix of fresh water and Marine species means it's also especially vulnerable to environmental changes.

在波罗的海，淡水和海洋生物很不寻常的结合在一起，这已经表明它很容易受到环境变化的影响。

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Algae can be fed from waste-streams of CO2 from fossil-fuel power stations as a carbon elimination strategy and can also decontaminate groundwater, so there is a potential mix of environmental solutions in aid of a common goal of fuel beyond oil.

FORBES: Biofuel From Algae: Different Prognoses

Our major firms are taking their social responsibilities much more seriously on environmental issues and community involvement motivated by a mix of corporate reputation, added value and altruism.

ECONOMIST: Staying Canadian

Without a more sustainable and balanced energy mix, the increase in fossil fuels will be appalling and costly, and the environmental effects devastating.

FORBES: What Is Our Energy Future?