**Summary:**The upcoming COP Thirty climate conference in Brazil is facing a significant setback as the US, the second-largest polluter, is unlikely to participate. This decision aligns with the Trump administration's broader rollback of climate policies, including withdrawing from the Paris agreement. The absence of US leadership is causing concern worldwide, with many countries not updating their carbon-cutting targets and even the European Union falling behind on its own goals. Experts warn that current plans, if fully implemented, would only reduce carbon pollution by less than 3% by 2030, falling short of what's needed to prevent dangerous climate tipping points. As the conference approaches, global leaders face mounting pressure to turn pledges into real progress, with challenges including China's growing coal use and low emissions targets.

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