Threats to Aquatic Environments - Dams, Freshwater Diversion And Use, Water Pollution Poses A Threat, Sediment—good And Bad, Air Pollution Affects Water Quality
According to the U.S. Geological Survey in "How Much Water Is There on (and in) the Earth?" (http://ga.water.usgs.gov/edu/earthhowmuch.html), about 326 million trillion gallons of water make up the total water supply of the planet. This provides an enormous aquatic habitat for a wide variety and number of animal and plant species. The aquatic environment is threatened by many human activities around the world. Humans consume vast amounts of freshwater and exert control over water flows in many rivers and streams. Land development, agricultural practices, industrialization, and commercial fishing have all affected the aquatic environment in some way.