Cleantech refers to the technology that is itself environmentally friendly or that helps reduce environmental problems; or the business sector that produces such technology. 

清洁科技指的是本身就很环保，或者能帮助减少环境问题的科技，也可以指生产此种技术产品的商业部门。

Venture capital investment in clean technology businesses rose sharply in 2007, reflecting political and consumer support for a greener economy. 

2007年，对清洁科技产业的风险投资出现大幅上升，反映出政治人士和消费者对环保经济的支持。