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The view of wetlands has changed with time.
One hundred years ago, large areas of Sweden's now rich agricultural landscape were wetlands. With clearly set goals to establish water control and drainage structures, wetlands have more or less disappeared. The loss of wetlands resulted in declines in landscape (and habitat) values, which has many negative aspects. Biodiversity decreased and release of nutrients (primarily nitrogen) increased, causing eutrophication in coastal areas. Research has shown how wetlands can be used as a tool in land use planning and water resources management. Various societal benefits ("ecosystem services") have been achieved by creating or restoring wetlands designed for specific functions.