But to me and my colleagues, those black roofs look like a vast untapped market.

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Right now, when you fly into a typical American city, you see miles of black roofs (mostly tarpaper shingles, made with a byproduct from burning coal), flanked by green lawns.

FORBES: Venture Capital: The Case For Investing In Solar

Dozens of houses with black-tiled roofs cluster around the port.

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Beware the Buggane -- a mischievous spirit who blows the roofs off buildings, or the ghostly Moddey Dhoo -- a nocturnal black dog associated with electrical storms.

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