"Can heat waves kill? At least 25 people lost their lives as a deadly heat wave hit the eastern US during the busy holiday weekend. Temperatures soared above 38 degrees Celsius in cities like Washington DC and Raleigh, while storms with strong winds and hail disrupted July 4th events. Millions were placed under heat alerts and thunderstorm watches. Cities like New York opened cooling centers and extended pool hours to help residents. Experts say a high pressure system is to blame, and rising global temperatures mean US heat waves now happen twice as often as 40 years ago. Is this serious? Share your view."