A historic June heat wave caused more than 15,000 people to be taken to hospital in an ambulance across Japan with heatstroke or heat exhaustion, a record high for the month, according to preliminary government data.The number of people treated in June totaled 15,657, the highest since comparable data became available in 2010, the Fire and Disaster Management Agency said Tuesday, more than doubling the previous high of 6,980 recorded in 2011.About 70 percent of cases were registered in the week between June 24 and 30, when the population sweated through a heat wave. In the month, a record h…READ FULL ARTICLE