He is an internationally recognized expert on public climate change beliefs, attitudes, policy support, and behavior, and the psychological, cultural, and political factors that shape them. He conducts research worldwide, including in the United States, China, India, Brazil, Indonesia, and Ireland. In 2020, he was named the second-most influential climate scientist in the world (of 1,000) by Reuters. He is also the host of Climate Connections, a radio program and podcast broadcast each day on more than 700 stations nationwide.