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The following are selected texts from the publication, reformatted for reading online.

• Downloadable GIS data used in PAGE freshwater maps.

• Freshwater systems: Executive summary. This study analyzes quantitative and qualitative information and develops selected indicators of the condition of the world’s freshwater systems.

• Freshwater systems: Human modification of freshwater systems. Freshwater systems have been altered since historical times, but such modifications skyrocketed in the early to mid-1990s.

• Freshwater Systems: Water quality. The definition of water quality is not objective, but is socially defined depending on the desired use of water. Different uses require different standards of water quality.

• Freshwater systems: Food production - inland fisheries. The principal factor threatening inland fisheries is the loss of fish habitat and environmental degradation.

• Freshwater systems: Biodiversity. One fundamental service provided by freshwater systems is habitat for a wide range of species.