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    Billionaire donor: Sustainable economy is the future

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Billionaire donor: Sustainable economy is the future

Tom Steyer is one of the most important Democratic donors in the United States; he speaks about his work on climate change. (Watch the rest of Amanpour's interview)

Billionaire donor: Sustainable economy is the future

Tom Steyer is one of the most important Democratic donors in the United States; he speaks about his work on climate change. (Watch the rest of Amanpour's interview)