Mercer calls this "free cold" and says it could be used as a cheap and green way to replace refrigeration units and air conditioning.

默瑟把这叫做“免费制冷”，还说它可用来取代冷藏机组和空调设备，既便宜又环保。

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Proponents are enthusiastic about the cheap, green energy; critics worry about the loss of natural beauty and the yearly filleting of thousands of songbirds and ducks.

支持者热衷于廉价绿色能源；而批评者担心失去了自然风光的美丽，以及每年数千只歌鸟和野鸭的身体碎片。

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Mr Murray’s idea is not just to produce vehicles that have a low impact on the environment but also to use a green (and cheap) manufacturing system to build them.

Murray先生的想法不仅仅是制造对环境危害小的汽车还包括使用一种绿色并且便宜的制造系统来制造他们。

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At the same time, the availability of a cheap and relatively green fuel may push up global energy consumption.

ECONOMIST: Natural gas

If the world is to reduce emissions, it needs technologies that are both green and cheap enough to be attractive to economically-stressed countries and people.

FORBES: Economists Moving Beyond Carbon Pricing

The committee agreed with the European Commission estimate that to achieve secure, green and cheap energy by 2020, a trillion euros will need to be spent on infrastructure.

BBC: Environment correspondent, BBC News