Climate change: Why are US senators wearing this symbol?

Climate Stripes, a graphic made by a UK academic, is being worn by US politicians posted on social media. …

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