我咨询了正在负责一项清洁能源项目的专家。

I asked one expert in charge of a clean-energy program.

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中方决定为非洲援建太阳能、沼气、小水电等100个清洁能源项目。

We have decided to build 100 clean energy projects for Africa covering solar power, bio-gas and small hydro-power.

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既然大多数清洁能源项目的效益回报期都在5年以上，那么“配额-贸易”制度并不能鼓励环保投资。

Since most clean-energy projects have a payback period of more than five years, the system thus fails to encourage green investment.

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