London mayor unveils plan to tackle 'climate emergency'

Exclusive: Sadiq Khan accuses government of dragging its feet and calls for investment to avert catastrophe

London's mayor, Sadiq Khan, has declared a climate emergency and urged the UK government to do more to avert an ecological breakdown that he says poses an existential threat to future generations.

Speaking as City Hall outlined its new climate change plan, Khan said he was implementing measures to protect people from floods, fires and the political upheaval caused by climate change. He accused central government of "dragging its feet" on dealing with these issues.