Study co-author Solomon Hsiang, from the University of California, Berkeley, says,"We have
been studying the effects of warming on conflict and violence for years, finding that people fight more when it's hot.
But the conclusion that rich countries should have benefited from warming is far less clear with limited support in this study… When one considers the possibility that warming in the current year might affect growth in future years, then the method employed by the study would suggest that most or
all rich countries probably have also lost income,” Hsiang told Axios.