The sound of climate change
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Paris climate deal signed: a new note on a long journey

Representatives of more than 170 countries are committing to the world's first comprehensive treaty to tackle climate change, at a ceremony at the United Nations in New York.

The agreement seeks to keep the increase in global temperatures below two degrees Celsius.

Neal Razzell charts how temperatures have risen since 1880.

(Photo: Greenland ice cap melting. Credit: Getty Images)

  • 22 Apr 2016