Parties Under Pressure Over Net-Zero Policies After Tories Won Uxbridge By-election

L: Labour leader Sir Keir Starmer speaking at the launch of the Labour Party's mission on cheaper green power in Edinburgh on June 19, 2023. (Jane Barlow/PA) R: Then-Chancellor of the Exchequer, Rishi Sunak, arrives at COP26 with his Green Budget Box in Glasgow, Scotland, on Nov. 3, 2021. Christopher Furlong/Getty Images

Environmentalists have urged the major parties to keep their green pledges as the parties also faced warnings that the net-zero push may cost them elections.

It comes after London Mayor Sadiq Khan’s Ultra Low Emission Zone (ULEZ) expansion was blamed for Labour’s loss in Thursday’s by-election in the Uxbridge and South Ruislip constituency.