Leaders from nearly 200 nations have gathered in Brazil for the United Nations’ 30th Climate Change Conference, known as COP30, to chart difficult next steps in the global fight against climate change. But the U.S. — the world’s second-largest emitter of planet-warming greenhouse gases — does not have any representatives from the Trump administration in attendance. The White House said no high-level U.S. officials would attend #COP30. President Trump has repeatedly dismissed human-caused climate