International enviromental regulations are paying off -- 20 years after acid rain killed trees in the Black Forrest and fish in Scandanavian lakes.New research shows acidic sulphur levels in Britain have been cut in half in the last 15 years. Unversity College London found algae, plants and insects are recovering -- creating the first links in a food chain that's resulted in the return of brown trout.
International treaties to reduce the levels of sulphur dioxide came about after acid rain was blamed for plant and animal deaths in the 1980s. (Reuters)
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