据估计，格拉斯霍姆岛上大约有18吨塑料垃圾。
It is estimated that there are 18 tons of plastic detritus on Grassholm .
没有自然天敌，也没有可以担忧的人类，格拉斯霍姆岛本应是英国最大海鸟塘鹅的天堂。
With no natural predators - and no human beings to worry about - Grassholm should be a paradise for Britain 's greatest seabird , the gannet .
霍姆岛