Heat waves are covering wider areas, and people are suffering the consequences. With 2°C of warming, most summers will look like 2018, scientists say. Eduardo Velev cools off in the spray of a fire hydrant in Philadelphia during a July 2018 heat wave. Scientists say last summer’s extreme heat across the Northern Hemisphere wouldn’t have happened without human-induced climate change. Credit: Jessica Kourkounis/Getty Images As temperatures spiked across a large part of the Northern Hemisphere last summer, I got an alarming call from my mother, who was living in Linz, Austria. She was dizzy and disoriented, and she hadn’t been sleeping. The region had been suffering through several weeks of above average day and nighttime temperatures, and when I arrived from Vienna, her apartment building felt like a concrete oven. Her symptoms sounded like heat exhaustion. We helped her pack a bag, checked on an elderly neighbor with similar […]