Traffic warden Rai Rogers mans his street corner during an 8-hour shift under the hot sun in Las Vegas, Nevada on July 12, 2023, where temperatures reached 106 degrees amid an ongoing heatwave. More than 50 million Americans are set to bake under dangerously high temperatures this week, from California to Texas to Florida, as a heat wave builds across the southern United States.Frederic J. Brown | Afp | Getty ImagesIf you feel like record-level extreme weather events are happening with alarming frequency, you’re not alone. Scientists say it’s not your imagination.”The number of simultaneous weather extremes we’re seeing right now in the Northern Hemisphere seems to exceed anything at least in my memory,” Michael Mann, professor of earth and environmental science at the University of Pennsylvania, told CNBC.Globally, June was the hottest June in the 174-year records kept by the National Oceani …
