Presentation at Friendly House by John Perona about the primary cause of global warming: -- carbon dioxide emissions. He then goes on to the global pledges to get climate change under control, focusing on a United Nations Climate meeting held in 2023. Then he sets forth a proposal for what's missing in the U.S. climate policy. John Perona is Professor of Environmental Biochemistry and Law at Portland State University. His research examines how advances in science and technology can be incorporated into policymaking.