Nina Fedoroff, science and technology adviser to Condoleezza Rice in the last administration and now to Hillary Clinton, tells the BBC that humans have exceeded the Earth's "limits of sustainability."

"We need to continue to decrease the growth rate of the global population; the planet can't support many more people," Fedoroff said. Meanwhile, we need to manage water and wild land better, she said.

There are currently 6.77 billion of us. Some time in October 2012 we'll cross the 7 billion mark. There are 261 people born every minute. [more facts].

[Read the Full Story at the BBC]

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