Leading mayors pledge emission-free cities by 2030
The mayors of London, Los Angeles, Paris and several other major world cities have pledged to ban petrol and diesel vehicles from "large parts" of their cities by 2030.
Some cities are moving even faster to reduce emissions, and Monday's announcement by leading metropolitan areas is a bid to encourage others to do the same.
Mayors meeting in Paris promised to "progressively abandon combustion engines" to make their cities cleaner and quieter, boost economic productivity and reduce pollution-related deaths.
Monday's pledge was released by the mayor of London, Sadiq Khan, as well as the mayors of Los Angeles, Paris, Mexico City, Seattle, Copenhagen, Barcelona, Vancouver, Milan, Quito, Cape Town and Auckland.
While US president Donald Trump is pulling out of the Paris climate agreement, US politicians are moving to reduce emissions on a local level.