Great Lakes Areas of Concern rivers, and oceans causing pollution and buildup of sediment. Nonpoint source pollution is said to be the most problematic and hardest to reverse of the types of pollution because it is so hard to regulate and pinpoint where it originates. Many experts agree that nonpoint source pollution is the biggest concern facing the Great Lakes. With the increase of urbanization, a toll has been taken on the lakes in these areas. Lakes that once had stable ecosystems with the appropriate amount of plant life are now full of massive amounts of plants and algae that have been fed by excess
Great Lakes Chemical Corporation plants. Great Lakes Chemical's involvement in the bromine business has its roots in leaded gasoline. When tetraethyl lead (TEL) was invented as a gasoline additive back in the 1920s, it was found to leave a corrosive byproduct in the engine. Adding ethylene dibromide (EDB) to TEL solved the problem. As leaded gasoline began to be phased out in the U.S., Great Lakes developed international markets for its products. Globalization of leaded gasoline makes TEL responsible for nearly 90 percent of airborne lead pollution in Third World cities. Some EDB in leaded gasoline converts to methyl bromide when burned. The World