Forty million people living in the Kanto region of Japan, which includes Tokyo, may be able to blame a meandering ocean current for increasing hot and humid summers, according to an analysis conducted by an international team of researchers. The Kuroshio Current flows north, bringing warm water from the tropics to Japan's southern coast. Since 2017, however, it has meandered off its traditional path, turning south before continuing north again. Now, scientists have found that the "large meander" is responsible for the uptick in humidity and temperature.