This article was originally titled "craziest" but to me a lot of these are pretty cool.

My favorite is the air conditioner that freezes water during the night, when it's cooler and electricity is cheaper, and lets it melt during the day, feeding the heat exchanger to cool the house. Users have experienced around a 30% energy savings with this technology.

Visit the link to see a solar powered cellphone, bamboo clothing, an electric roadster and more. (The image is of the solar cellphone, since the green air conditioner doesn't look like anything special.)

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