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dipsydoodle

(42,239 posts)
Mon Jun 2, 2014, 04:39 AM Jun 2014

Urban rivers cleanest for 20 years, Cardiff University says

Britain's urban rivers are the cleanest they have been for more than two decades, a study has found.

More than 2,300 river sites in England and Wales were analysed between 1991 and 2011 by Cardiff University.

They examined the presence and spread of 78 organisms - including insects, snails and others - and claim many are making a comeback following decline.

The scientists say the improvements are largely due to reductions in pollution levels.

The study measured the presence of "clean-river invertebrates" as a "yardstick for river health", using data from Natural Resources Wales and the Environment Agency.

http://www.bbc.co.uk/news/uk-wales-27656357

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