题型：阅读理解 题类：模拟题 难易度：普通
安徽省六安市2019-2020学年高三英语年级最后一卷试卷
A study has warned that seafood supplies from the world's oceans could be almost gone by the middle of the century. The researchers say there has already been a breakdown in wild populations of almost one third of currently fished sea-foods. The study says that means their catch has fallen by ninety percent from their highest level. Boris Worm of Dalhousie University in Nova Scotia Canada led the intentional team that did the study. Professor Worm says species have recently been disappearing from oceans at an increasing speed. At this rate he says all seafood species could collapse by 2048.
Other studies have also warned about the dangers of overfishing and the effects on ocean environments. But not everyone thinks the oceans are likely to be empty, in, fifty years. Some scientists said parts of the world do have problems but others are doing a good job of protecting fish populations. Government officials in several countries with large fishing industries also questioned the research.
The study appeared earlier this month in Science magazine.
The researchers say damage to oceans affects not only fish populations but also the productivity of ecosystems. These complex systems help control water quality. The scientists say the loss of different kinds of sea life appears to increase the risk of fish kills and beach closures from harmful algae growth.
The scientists examined the results of thirty-two experiments and observed forty-eight protected areas. They also looked at records of catches worldwide. They studied records from the United Nations Food and Agriculture Organization from 1950 to 2003. And they examined archaeological information and other historical records for twelve coastal areas. That research reached back over a thousand years.
Boris Worm says the findings are, in his words, "beyond anything we suspected." But he also said the situation is not too late to core. He said that with good fisheries management, some species could completely recover in three to ten years.
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