CBS News @CBSNews
The extreme heat that continues to grip the U.S. is far worse in major cities, where what's known as "the heat island effect" can make temperatures 20ºF warmer than surrounding areas. And with global warming, experts expect it will only get worse. https://t.co/FPUI6SmoIs https://t.co/m2Rxu8hm0V — PolitiTweet.org