Daily Green: Heat waves will become more intense throughout the century due to global warming, and the U.S. Midwest is among the most vulnerable to dangerous heat, according to a new study. While the news reported about high temperatures and global warming typically focuses on the rising average temperatures, it’s the temperature extremes that matter most. While the average temperature by 2100 might rise 5.4 degrees, the hottest of the hot days will be 14.4 degrees warmer, according to the study …