World leaders, remember that future generations will judge you. At Cop30, you can define how | Gordon Brown

Keir Starmer is taking the lead on tackling the climate crisis. With the US backing away, now is the moment when other nations must step up

With the once-familiar pillars of the old world order crumbling and the US stepping away from action on climate crisis, it falls to others to assume global environmental leadership. Those leaders who understand the urgency should seize the opportunity afforded by Brazil hosting Cop30 this month to build a coalition of committed countries determined to turn back the climate deniers.

Many now see China - the most successful manufacturer of solar, wind, battery and electric vehicle technologies - as the global low-carbon powerhouse. But its national emission goals, recently submitted to the UN, are underwhelming and it is unclear whether China is willing to take up the mantle of climate leadership.