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A new study shows that 86 per cent of the world's rivers have been damaged by human [active / activity] . The study was [conduct / conducted] by researchers from a university in Toulouse, France. They [exam / examined] data on over 2,500 rivers [about / around] the world. They did not look at rivers in the polar regions [of / at] the Arctic and Antarctica or in deserts. The scientists looked into changes to biodiversity [under / over] the past 200 years. They discovered that biodiversity in over half of rivers has been [seriously / serious] damaged by humans. The researchers said there were many [reason / reasons] for this damage. A big reason is the introduction of new species [of / to] fish into rivers. Other reasons include pollution, dams, overfishing, farming and climate [change / charge] .

The researchers say the worst-hit rivers are [on / in] western Europe and North America. This is because these regions have large and [rich / richly] towns and [city / cities] . The lead researcher said: "Rivers which have the most [economic / economical] development around them, like the Mississippi River, are the most strongly [impact / impacted] ." The River Thames in London was one of the worst-affected rivers [in / at] the study. The least-impacted rivers are in Africa and Australia. The researcher said: "This is probably [dew / due] to a slower rate of industrialisation in Africa and [lone / low] population density around rivers in Australia." He [added / adding] that rivers in many rich nations are unrecognisable compared with how they were 200 years [ago / age] .