Her OB-GYN prescribed an antidepressant, and wasn't helpful in answering Hansen's questions about the dosage, she said.

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Because I think there are still too many Americans who don't understand the urgency that somebody like a Jim Hansen, lead scientist from NASA, you know, on climate, is saying we must act now.

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It will go down under the heading of 'things you wish you had never said' - alongside Alan Hansen's 'you don't win anything with kids' comment on Match of the Day eight years ago.

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Most people Hansen talks to are surprised that hearing aids aren't typically covered by insurance.

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"He looks young on the podium, but he doesn't act young, " L.A. Philharmonic violist Dana Hansen says.

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"At that time it wasn't considered an emergency, even though they had several feet of water inside the boat, " Hansen said.

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Dr Hansen says he wants to use his retirement to speak and give evidence in ways that he couldn't do as a government employee.

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