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Labour's opposition to new exploration licences represented "genuine leadership" he added, and the party was right "to debunk scare stories being peddled by climate delayers".

The Green Party MP, Caroline Lucas, said "climate delayers" and those who impeded solutions to curbing emissions "should be nowhere near government policy".

“If it’s not a dream killer, it’s a dream delayer,” he says.

Sadiq Khan said: "I'm determined that we continue to be doers, not delayers - not only to protect Londoners' health right now, but for the sake of future generations to come."

Shortly afterward, Representative Alexandria Ocasio-Cortez of New York called her a climate delayer.