The interview process tests not what the applicants know but how well they can process tricky questions: If you wanted to figure out how many times on average you would have to flip the pages of the Manhattan phone book to find a specific name, how would you approach the problem?

CNN: In Search Of The Real Bill Gates

To find additional information on how we can solve the problem of childhood obesity within a generation, visit www.

WHITEHOUSE: The White House

Did any of them bother to ask how likely it was that the people who so poorly understood the problem would be able to find the remedy for it?

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The problem, however, is how to find volunteers ready to chip in.

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But while we dither over not just how to find a solution but whether we have a problem, the costs of dealing with climate change are rising along with atmospheric temperatures.

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"Clearly that means that you get a lot of images and part of the problem that we are solving is how do you sort through those images to find the good images among all the junk, " he told the BBC programme Go Digital.

BBC: NEWS | Technology | Camera specs take candid snaps