Many parts of the world are experiencing record heat this summer, with temperatures soaring well above 40 degrees Celsius in places where 35 used to be the high. The largest-ever forest fires are raging in the U.S. western state of California after deadly flames swept along coastal Greece. Some Asian cities also have hit the highest temperatures on record. A new study warns these and other signs of global warming will become more frequent. VOA's Zlatica Hoke has more.