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