Kagoshima, Sept. 4 (Jiji Press)--The global matcha boom is driving up prices in Japan for "tencha," the raw material for the finely ground green tea powder.The shipping price of tencha has more than doubled due to strong demand both at home and abroad."People bought as much (matcha) as we had in stock," said Kenta Ikeda, CEO of Ikeda Seicha Co., a tea seller in Kagoshima Prefecture, southwestern Japan.He said that 30-gram canned matcha had been …