“We’re seeing temperatures increase, we’re seeing heat waves become more common,” said Amir Jina, an assistant professor at the University of Chicago’s Harris School of Public Policy and the Climate Impact Lab who researches how environmental change affects societal development. “This is really an effect less borne by the person in the high-paying job in an air-conditioned office” and more by people in lower-income jobs, such as warehouse workers and delivery drivers. “This is not a problem equally felt across society,” he said.