quality:corruption
Conservation

Wetlands have historically subjected to large draining efforts for development (real estate or agriculture), and flooding to create recreational lakes or generate hydropower. Some of the world's most important agricultural areas were wetlands that have been converted to farmland. Since the 1970s, more focus has been put on preserving wetlands for their natural functions. Since 1900, 65–70% of the world's wetlands have been lost. In order to maintain wetlands and sustain their functions, alterations and disturbances that are outside the normal range of variation should be minimized.