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In this Feb. 12, 2014, photo Bitcoin buttons are displayed on a table at the Inside Bitcoins conference in Berlin. Researchers calculate that the electricity required for the virtual currency bitcoin generates as much carbon dioxide as cities like Las Vegas or Hamburg. (AP Photo/Frank Jordans) **FILE**

In this Feb. 12, 2014, photo Bitcoin buttons are displayed on a table at the Inside Bitcoins conference in Berlin. Researchers calculate that the electricity required for the virtual currency bitcoin generates as much carbon dioxide as cities like Las Vegas or Hamburg. (AP Photo/Frank Jordans) **FILE**

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