Hansen is arguably the world's leading researcher on global warming. He's the head of NASA's top institute studying the climate. But as correspondent Scott Pelley first reported last spring, this imminent scientist says that the Bush administration is restricting who he can talk to and editing what he can say. Politicians, he says, are rewriting the science.
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Hansen has a theory that man has just 10 years to reduce greenhouse gases before global warming reaches what he calls a tipping point and becomes unstoppable. He says the White House is blocking that message.
"In my more than three decades in the government I've never witnessed such restrictions on the ability of scientists to communicate with the public," says Hansen.
But he didn't hold back speaking to Pelley, telling 60 Minutes what he knows.
I'm a very lucky person with every allergy known to man but still happy to be enjoying a wonderful life living in the best place in the world!