Sadiq Khan and megacity mayors urge G20 climate change action

30 mayors from cities including London, Paris, Tokyo, Sydney, New York, Cape Town and Rio de Janeiro call for rapid ratification of Paris climate dealLondon Mayor Sadiq Khan has joined forces with city leaders from around the world to call on governments to take urgent action on climate change.Ahead of a meeting of the G20 group of leading nations in Hangzhou, China, 30 mayors from cities including London, Paris, Tokyo, Sydney, New York, Cape Town and Rio de Janeiro called on national leaders to