His words almost seemed to be part of a different reality than the one described by other speakers who talked about the urgency of addressing climate change and adopting renewable energy. Some environmental advocates were concerned that he would withdraw the United States from the United Nations Framework Convention on Climate Change, a 1992 treaty that guides international efforts to combat climate change. For example, he said the United Nations has consistently been wrong in its forecasts of climate change. Donate NowBut Guterres warned that growth in renewable energy needs to accelerate for the world to have a chance of avoiding the worst effects of climate change. But people who have worked on U.S. and global climate policy were baffled and horrified by Trump’s speech.