Andy Burnham will “sleepwalk” into climate disaster if he fails to get a grip on a series of important policies whose combined impact could scupper plans to reach net zero, campaigners have said.

Big decisions on North Sea drilling, the expansion of Heathrow airport, electric vehicles (EVs) and grants for heat pumps are awaiting decisions from ministers.

But they should be considered in the context of their cumulative impacts rather than be taken separately by different government departments, according to Greenpeace and Friends of the Earth (FoE) in a letter to the prime minister.