Environmental Economic Impact of Pollution in the Chesapeake Bay

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Environmental Economics Environmental Economic Impact of Pollution in the Chesapeake BayThe Chesapeake Bay is the nation’s largest estuary with six major tributaries, the James, the Potomac, the Susquehanna, the Patuxent, the York, and the Rappahannock Rivers, feeding into the bay from various locations in Maryland, Virginia, Pennsylvania, and the District of Columbia (Chemical Contaminants in the Chesapeake Bay – Workshop Discussion 1). These areas depend on the Bay as both an environmental and an economic resource. Throughout the last 15 years the Chesapeake Bay has suffered from elevated levels of pollution. Nitrogen and phosphorous from wastewater treatment plants, farmland, air pollution, and development all lead to reduced water clarity and lowered oxygen levels, which harm fish, crabs, oysters and underwater grasses (Key Commission Issues 1). There are other types of pollution in the bay such as toxic chemicals, but because nutrient pollution is the most significant and most widespread in the Bay its effects are the most harmful to fisheries. Nitrogen and phosphorous fuel algal blooms which cloud the water and block sunlight from reaching underwater grass beds that provide food and habitat for waterfowl, juvenile fish, blue crabs, and other species (Blankenship 11-12). Algae plays a vital role in the food chain by providing food for small fish and oysters. However, when there is an overabundance of algae it dies, sinks to the bottom of the Bay, and decomposes in such a manner that depletes the oxygen levels of the Bay (11). The reduced oxygen levels in the Bay reduce the carrying capacity of the environment and these “dead areas” sometimes kill off species that can not migrate to other areas of the Bay, such as oysters (11). Increased abundance of algal blooms also led to the overabundance of harmful and toxic algae species and microbes such as the microbe Pfiesteria, which was responsible in 1997 for eating fish alive and making dozens of people sick (12). The heightened awareness of diseases that can be contracted through consumption of contaminated fish also has an economic impact. Therefore, the excess levels of nitrogen and phosphorous have fueled an overabundance of algal blooms, which has reduced water clarity and lowered oxygen levels, affecting many species within the bay and ultimately the industries that rely on these species.The signing of the 1987 Chesapeake Bay Agreement marked the first joint venture between Virginia, Maryland, Pennsylvania, the District of Columbia, the Environmental Protection Agency, and the Chesapeake Bay Commission to improve water quality by reducing point and non-point source pollution (The Chesapeake Bay Watershed 1). The goal of this program was to reduce the level of nitrogen and phosphorous flowing to the Bay by 40% by the year 2000, from their 1985 levels (Blankenship 2). The first step in this program was to reduce the amount of nutrient pollution from point sources (end-of-the-pipe) such as wastewater treatment facilities that feed into the many tributaries of the Chesapeake Bay (The Chesapeake Bay Watershed 1). However,
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the results of these cleanup efforts were not enough to reach the goal of the program. Therefore, the areas involved now had to target the non-point sources of nitrogen and phosphorous. The non-point sources are storm water run off from agricultural and developed sites, air pollution, and the development of sensitive forests that act as buffers for tributaries and the Bay (1). The Chesapeake Bay Preservation Act of 1989 took aim at these sources in Tidewater Virginia by requiring resource management practices in the use and development of environmentally sensitive land (1). The Chesapeake Bay Preservation Area Ordinance of 1991 ...

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