It safeguards more than 1, 000 miles of our rivers, protects watersheds and cleans up polluted groundwater, defends our oceans and Great Lakes, and will revitalize our fisheries, returning fish to rivers that have not seen them in decades.

WHITEHOUSE: President Obama Signs Major Public Lands Protections

Timber-cutting was blamed for a while, but most commercial tree farms have more fish in their rivers than in those of urban areas.

ECONOMIST: Cities and the environment

Forest nomads are losing their way of life, fish stocks have dwindled as topsoil has been washed into rivers, and wood is denied to those who want to build houses and boats, says Forests Monitor, an environmental group.

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According to American Rivers, dividing the navigation season is necessary to restore Missouri river fish and wildlife, which have suffered from past management policies.

CNN: Missouri River destiny hangs in the balance