A dangerous heatwave is breaking March temperature records across the US Southwest, attributed to climate change. Experts warn that unprecedented weather extremes are becoming more common, putting more people at risk. The heatwave, with temperatures reaching 43.3°C in Arizona, is classified as ultra-extreme and is part of a trend of increasing extreme weather events. Climate scientists emphasize the role of human-caused climate change in exacerbating these conditions, leading to more frequent and severe weather disasters.