Finland improves water environment.
D005068:Eutrophication; D005387:Finland; D006801:Humans; D006863:Hydrogen-Ion Concentration; D012621:Seasons; D012722:Sewage; D012989:Soil Pollutants; D014876:Water Pollution / Q000331:legislation & jurisprudence / Q000517:prevention & control*
D012722:Sewage; D012989:Soil Pollutants