Frequent disposal of plastic waste such as bags and bottles poses a serious problem for wild brown bears in a sanctuary in northern Japan, conservationists say, warning that the animals could begin approaching humans if they acquire a taste for garbage.The Shiretoko Peninsula in eastern Hokkaido, Japan's northernmost main island, has one of the densest bear populations in the world according to the Environment Ministry, which estimates that over 200 wild brown bears live in the area.According to Shiretoko Nature Foundation, a staff member spotted a bear cub about 80 centimeters in length ca…READ FULL ARTICLE