The cities of the world are united and speaking with one voice, according to the Mayor of Bonn, Germany.

Jürgen Nimptsch says he’s at the UN for the Climate Summit wearing a second hat, that of vice chair of the World Mayors Council on Climate Change.

Under the auspices of this Council, an initiative called “Carbonn” is the world’s largest database on local climate action.

Often described as the German UN city, Bonn hosts 18 UN organisations, including the Secretariat of the UN Framework Convention on Climate Change (UNFCCC).

Mr Nimptsch told Stephanie Coutrix about Carbonn and how it’s helping to unite cities against climate change.

Duration: 2’59”