William A. Happer

William A. Happer is an American physicist known for his work on atomic physics, optics, and climate science. He has contributed to understanding how light interacts with matter and has been involved in research on the role of carbon dioxide in Earth's climate. Happer has also been a vocal critic of some climate change policies, emphasizing the complexity of climate systems and cautioning against overreliance on models. Throughout his career, he has held academic and government positions, promoting scientific inquiry and debate on issues related to physics and environmental science.