A record-setting heatwave across East Asia is straining power grids and raising concerns about farming and water supplies. Experts blame the temperatures on the overall warming of the planet, as well as increasing urbanization in Japanese cities. Visitors to the Toshimaen amusement park in Tokyo witnessed the overcrowding firsthand on Friday. About 13,000 holiday makers visited the venue during the heatwave, which coincided with the start of Japan's traditional Obon (Festival of the Dead) summer vacation.