1.Humans are responsible for nearly every loss of species in the past few thousand years.
2.Low-lying Pacific Islands are suffering coastal erosion and crop failures.
3.If pollution continue to increase at the present rate,aerosols in the atmosphere will cause the onset of an ice age in about fifty years'time.
參考答案:1.人类要为在过去数千年中每个几乎灭绝的物种负责。
2.低地势的太平洋群岛正在遭受着海岸线被侵蚀、谷物歉收的危险。
3.如果污染仍以目前的速率继续增长，大气中的浮质将会导致近50年冰川世纪的到来。
