Ed Hawkins, a climate scientist at the University of Reading, created a graphic that represents how the world is becoming warmer.
US Democrat senators Tom Carper, Sheldon Whitehouse and Chris Van Hollen wore it as a badge at the State of the Union address.
Video produced by Christopher Giles and Lorna Acquah
This article was originally published by Bbc.co.uk. Read the original article here.
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