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เกิดไรขันกังสั้งแวดล้อมyo) (งา
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What is happening to.the Environment? Rivers
mพัยใหม่
A new study shows that 86 per
สะพวณขัมแม่น้ำเทพ
cent of the world's rivers have been
damaged by human activity. The
study was Conducted by researchers
from a university in Toulouse, France.
เคทะน์
They examined data on over 2,500
rivers around the world)but they did
not Look at rivers in the polar regions
of the Arctic and Antarctica or in deserts.)The scientists looked into changes to
biodiversity over the past 200 years. They)discovered that biodiversity in over half
of rivers has been seriously damaged by humans. The researchers said there were
many reasons for this damage. A big reason is the introduction of new species of
fish into rivers. Other reasons include polution, dams, overfishing, farming and
ปลก) : อ่างๆ mราะน
climate change.
The researchers say the worst-hit rivers are in western Europe and North
America. This is because these regions have large and rich towns and cities. The
เมือที่มาฐานางเบ
lead researcher said: "Rivers which have the most economic development around ่"ง
them, like the Mississippi River, are the most strongly impacted." The River
Thames inj London was one of the worst-affected rivers in the study. The least-
impacted rivers are in Africa and Australia.
The researcher said: "This is probably due to a slower rate of
สูคนที่ 90 191 เสชมา ความ นนา Iณนนยฆาก
industrialisation in Africa and low population density around rivers in Australia."
He added that rivers in many rich nations are unrecognisable compared with how
they were 200 years ago.
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Acknowledgement
