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Fishermen on the high seas have plenty of worries, not the least of which are boat-tossing

storms, territorial squabbles and even pirates. Now Boris Worm, a marine biologist at Dalhousie University in Halifax, Canada, has added another. After studying, among other things, global catch data over more than 50 years, he and a team of 13 researchers in four countries have come to a stunning conclusion. By the middle of this century, fishermen will have almost nothing left to catch. "None of us regular working folk are going to be able to afford seafood," says Stephen Palumbi, a Stanford University marine biologist and co-author of the study published in Science. "It's going to be too rare and too expensive."

Don't tell that to your local sushi chef. Over the past three decades, the fish export trade has grown fourfold, to 30 million tons, and its value has increased ninefold, to $ 71 billion. The dietary attractiveness of seafood has stoked demand. About 90% of the ocean's big predators—like cod and tuna—have been fished out of existence. Increasingly, fish and shrimp farms are filling the shortfall. Though touted as a solution to over fishing, many of them have—along with rampant coastal development, climate change and pollution—devastated the reefs, mangroves and seagrass beds where many commercially valuable fish hatch.

Steven Murawski, chief scientist at the U. S. National Marine Fisheries Service, finds Worm's headlining prediction far too pessimistic. Industry experts are even more skeptical. "There's now a global effort to reduce or eliminate fishing practices that aren't sustainable," says industry analyst Howard Johnson. "With that increased awareness, these projections just aren't realistic. "

Perhaps. Still, the destructive fishing practices that have decimated tuna and cod have not declined worldwide, as Johnson suggests. Up to half the marine life caught by fishers is discarded, often dead, as by catch, and vibrant coral forests are still being stripped bare by dragnets. Worm argues that fisheries based on ecosystems stripped of their biological diversity are especially prone to collapse. At least 29% of fished species have already collapsed, according to the study, and the trend is accelerating.

So what's a fish eater to do？ "Vote with your wallet," says Michael Sutton, who runs the Monterey Bay Aquarium's Seafood Watch program in California. Since 1999, the aquarium has handed out pocket guides listing sustainably harvested seafood. The Marine Stewardship Council has partnered with corporations to similarly certify wild and farm-raised seafood. Some 370 products in more than two dozen countries bear the British group's "Fish Forever" label of approval. Wal-Mart and Red Lobster, among others, have made commitments to sell sustainably harvested seafood.

But that's just a spit in the ocean unless consumers in Japan, India, China and Europe join the chorus for change. "If everyone in the U. S. started eating sustainable seafood," says Worldwatch Institute senior researcher Brian Halweil, "it would be wonderful, but it wouldn't address the global issues. We're at the very beginning of this."

It can be inferred from the first paragraph that

A．fishermen are afraid of pirates and storms most.

B．people should take measures to secure fish supply.

C．about 50 years later, we won't be able to eat fish.

D．Worm expects global catch data to continue surging.

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更多“Fishermen on the high seas have plenty of worries, not the least of which are boat-tossing”相关的问题

第1题

在Visual FoxPro中有如下程序： *程序名:TEST.PRG SET TALK OFF CLEAR ALL mX="Visual FoxPro"

在Visual FoxPro中有如下程序：

*程序名:TEST.PRG

SET TALK OFF

CLEAR ALL

mX="Visual FoxPro"

mY="二级"

DO SUB1 WITH mX

？mY+mX

RETURN

*过程 SUB1

PROCEDURE SUB1

PARAMETERS mX1

LOCAL mX

mX="visual FoxPro DBMS考试"

mY="计算机等级"+mY

ENDPROC

执行命令DO TEST后，屏幕的显示结果为( )。

A．二级Visual FoxPro

B．计算机等级二级Visual FoxPro DBMS考试

C．二级Visual FoxPro DBMS考试

D．计算机等级二级Visual FoxPro

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第2题

在Visual FoxPro 中有如下程序文件TEST: *程序名:TEST.PRG *调用方法:DO TEST SET TALK OFF CLOS

在Visual FoxPro 中有如下程序文件TEST:

*程序名:TEST.PRG

*调用方法:DO TEST

SET TALK OFF

CLOSE ALL

mX=＂Visual FoxPro＂

mY=＂二级＂

DO SUB1 WITH mY

？mY+mX

RETURN

*子程序:SUB1.PRG

PROCEDURE SUB1

PARAMETERS mY

mY=＂计算机等级＂+mY

RETURN

执行命令DO TEST后,屏幕的显示结果为

A．二级Visual FoxPro

B．计算机等级二级Visual FoxPro

C．计算机等级Visual FoxPro

D．计算机等级二级

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第3题

在Visual FoxPro中，有如下程序： *程序名：TEST.PRG *调用方法：DO TEST SET TALK OFF PRIVATE X,Y

X="Visual FoxPro" Y="二级" DO SUB WITH X ？Y+X RETURN *子程序：SUB PROCEDURE SUB PARAMETER

A．二级Visual FoxPro

B．计算机等级二级Visual FoxPro考试

C．二级Visual FoxPro考试

D．计算机等级二级Visual FoxPro

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第4题

在Visual FoxPro中有如下程序文件TEST：*程序名：TEST.PRG*调用方法：DO TESTSET TALK OFFCLOSE ALL

在Visual FoxPro中有如下程序文件TEST： *程序名：TEST.PRG *调用方法：DO TEST SET TALK OFF CLOSE ALL mX＝“Visual FoxPro” mY＝“二级” DO SUB1 WITH mY ？mY+mX RETURN *子程序：SUB1.PRG PROCEDURE SUB1 PARAMETERS mY mY＝“计算机等级”+mY RETURN 执行命令DO TEST后，屏幕的显示结果为

A．二级Visual FoxPro

B．计算机等级二级Visual FoxPro

C．计算机等级Visual FoxPro

D．计算机等级二级

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第5题

在Visual PoxPro中有如下程序文件TEST：*程序名：TEST.PRG*调用方法：DO TESTSET TALK OFFCLOSE ALL

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A．二级Visual FoxPro

B．计算机等级二级Visual FoxPro

C．计算机等级Visual FoxPro

D．计算机等级二级

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第6题

在 Visual FoxPro 中，有如下程序：* 程序名： TEST.PRGSET TALK OFFPRIVATE X,YX= " 数据库 "

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* 程序名： TEST.PRG

SET TALK OFF

PRIVATE X,Y

X= " 数据库 "

Y= " 管理系统 "

DO subl

？ X+Y

RETURN

* 子程序： subl

PROCEDU subl

LOCAL X

X= " 应用 "

Y= " 系统 "

X=X+Y

RETURN

执行命令 DO TEST 后，屏幕显示的结果应是【 13 】。

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第7题

在Visual FoxPro中有如下程序：*程序名：TEST.PRG*调用方法：DO TESTSET TALK OFFCLOSE ALLCLEAR AL

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A．二级Visual FoxPro

B．计算机等级二级Visual FoxPro DBMS考试

C．二级Visual FoxPro DBMS考试

D．计算机等级二级Visual FoxPro

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第8题

在Visual FoxPro中有如下程序：*程序名: TEST.PRG*调用方法: DO TESTSET TALK OFFCLOSE ALLCLEAR

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A．二级Visual FoxPro

B．计算机等级二级Visual FoxPro DBMS考试

C．二级Visual FoxPro DBMS考试

D．计算机等级二级Visual FoxPro

点击查看答案

第9题

在Visual FoxPro中，有下列程序：*程序名：TEST.PRG*调用方法：DO TESTSET TALK OFFPRIVATE X,YX="Vi

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A．二级Visual FoxPro

B．计算机等级二级Visual FoxPro考试

C．二级Visual FoxPro考试

D．计算机等级二级Visual FoxPro

点击查看答案

第10题

在Visual FoxPro中，有下列程序：*程序名：TEST.PRG*调用方法：DO TESTSET TALK OFFPRIVATE X,YX="Vi

在Visual FoxPro中，有下列程序：

*程序名：TEST.PRG

*调用方法：DO TEST

SET TALK OFF

PRIVATE X,Y

X="Visual FoxPro"

Y="二级"

DO SUB WITH X

？Y+X

RETURN

*子程序：SUB

PROCEDURE SUB

PARAMETERS X1

LOCAL X

X="Visual FoxPro DBMS 考试"

Y="计算机等级"+Y

RETURN

执行命令DO TEST后，屏幕显示的结果为()。

A．二级Visual FoxPro

B．计算机等级二级Visual FoxPro考试

C．二级Visual FoxPro考试

D．计算机等级二级Visual FoxPro

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