LatticePower, started by a physicist with skills and experience honed in China, is a good example of this new trend with its breakthrough technology for making a highly efficient source of light.

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The next is that run through a fuel cell, hydrogen is an efficient source of energy.

FORBES: Magazine Article

"It's the most benign and efficient source of energy that I can imagine, " he says.

FORBES: Galactic Gold Mine?

Part of what has made WikiLeaks so much more effective than traditional hacking efforts, after all, is that whistleblowers with privileged accounts within computer networks are a far more efficient source of embarrassing data than hacking techniques such as random searches of filesharing networks.

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Higher property taxes would be an efficient and progressive source of revenue.

ECONOMIST: Policy prescriptions

The most efficient foundations are usually those where the celebrity is the sole source of the funds--there are no fundraising expenses.

FORBES: Sweet Charity

During the 2000s, companies lost interest in IT as a source of competitive differentiation and focused on trying to make it more efficient by shifting basic functions to lower cost countries.

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As efficient lighting technologies, like LEDs, go mainstream they become almost like a new source of green energy.

FORBES: A New Source of Green Energy: LEDs