![the extreme heat to come](https://www.ioes.ucla.edu/wp-content/uploads/2017/06/los-angeles-800x450.jpg)
Climate researchers at the University of California, Los Angeles, have created forecasts of how many days of extreme heat — defined as more than 95 degrees — the Los Angeles region could expect if nothing was done to reduce greenhouse gas emissions. Downtown Los Angeles, for example, now has roughly a week’s worth of extreme heat days a year, said Alex Hall, a professor of atmospheric and oceanic sciences at U.C.L.A.