Keir Starmer, climate leader (when the Treasury lets him)

By Charlie Cooper | 11/07/2025 06:12 AM EST

The U.K. prime minister is heading to the COP30 climate summit in Brazil to show climate still matters Britain, even in the age of Trump. But back at home, Starmer blows hot and cold on all things green.

LONDON, ENGLAND - SEPTEMBER 10: UK Prime Minister Keir Starmer its at a table as he speaks to Israel's President Isaac Herzog (not pictured) to 10 Downing Street on September 10, 2025 in London, England. Starmer is welcoming Herzog to Downing Street as pro-Palestinian groups have called for Herzog's arrest for his role in alleged war crimes in Gaza. Herzog's three-day visit comes ahead of the UK's expected recognition of a Palestinian state, "unless the Israeli government takes substantive steps to end the appalling situation in Gaza, agree to a ceasefire, and commit to a long-term sustainable peace reviving the prospect of a two-state solution," according to Starmer's previous pledge. (Photo by Alberto Pezzali - WPA Pool/Getty Images)

Keir Starmer, while not an expert, is instinctively supportive of climate action, said one government official. Getty Images

LONDON — Keir Starmer loves to play the climate leader. But only when his political advisers (and the powerful Chancellor Rachel Reeves) tell him he’s allowed.

The green-minded U.K. prime minister flies into the COP30 summit in Brazil on Thursday, armed with undeniable climate credentials.

His government is pressing ahead with a 2050 net-zero target, even as right-wing political rivals at home run away from it. It is about to hand 20-year contracts, laden with financial guarantees, to companies developing offshore wind farms. Just by attending COP, Starmer has shown he’s willing to publicly back the faltering global climate cause, despite furious attacks on the green agenda by close ally President Donald Trump.

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But his claim to global leadership comes with a catch.

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