At the COP30 climate summit in Brazil, world leaders sharply criticized U.S. President Donald Trump’s climate-change stance, warning that his absence undermines global cooperation. Delegates from dozens of countries used the opening session Thursday to reaffirm the need for bold action, accusing Trump of retreating from commitments and hampering progress on the climate emergency. The summit’s agenda includes a bold plan to mobilize $1.3 trillion annually for climate finance, deepen private-sector participation and reform multilateral lending to steer funds toward low-carbon development. Brazilian organizers said the gathering set in the Amazon forest underscores the urgency of preserving landscapes vital to regulating global temperature, even as key emitters such as the U.S. appear disengaged. Attendees will try to negotiate a new climate deal over the next two weeks while leaders of the world’s largest nations – India, Russia, US and China – are noticeably absent.