The windows are dark; the door shut; the clean wind goes about and about it, and cannot find an entrance.

它黑漆漆的窗，紧闭的门户，清新的风儿绕着它也无法吹进。

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Wind power is a very clean source of energy.

风能是一种非常清洁的能源。

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He talked about ways that tribes could more easily develop clean energy such as solar power and wind energy.

VOA: special.2009.11.13

"If we had a clean energy economy powered by wind and solar and tidal power we probably would not be here having this discussion today."

VOA: standard.2010.07.31

Solar Wind Energy (which used to be called Clean Wind Energy Tower, Inc.) is negotiating for a lease from the Bureau of Land Management (BLM) for a 1, 700-acre parcel of flat, empty desert on the Mexican border, right next to an Air Force bombing range.

FORBES: Massive Energy Skyscraper Proposed On U.S.-Mexico Border

Nukes may not be quite as clean as wind, solar or geothermal, but they provide a carbon-free and domestic source of energy that produces lots of jobs.

FORBES: On Eve Of Nuclear Renaissance, Florida Nuke Project Gets Postponed

There are sound economic and other reasons why new, clean technologies like wind, solar, advanced biofuels and batteries should be supported even though they currently cost more then fossil fuel technologies.

FORBES: The Case For A Green Bank