A village leader from Borneo...handed a petition of 140,000 signatures to Tokyo's embassy in Bern, Switzerland, demanding it halt use of deforestation-linked tropical timber in its Olympic venues. Japan is hosting the games in 2020 with a wooden latticed stadium, now under construction, as the dramatic centerpiece..But last month, a group of charities said some timber came from a Malaysian logging giant that is accused of deforestation and human rights violations, in breach of Japan's pledge to hold a sustainable Olympics ...Oyoi told the Thomson Reuters Foundation he hoped Japanese officials would understand that by using cheap timber, they were contributing to the death of traditional life for indigenous groups....Japan's Sport Council (JSC), the government body in charge of building Olympic venues... said tropical timber was being used but that it met certification standards agreed by Japan's Olympic organiser....Rights groups have demanded an overhaul of procurement and an investigation into the legality and sustainability of tropical wood.