Diagram the problem and solution utilizing poster board, computer technology, video taping, or models. DDT has been used as a pesticide in the past. It has been outlawed for over 40 years because the pesticide was carried through the food chain and was linked to the weakness of eggshells of birds of prey like the bald eagle. In Washington County, a city has not stopped using the pesticide to kill mosquitoes. Herbicides are place on grass in subdivisions to kill weeds.
Rainwater can carry the herbicides into the sewer systems.
This can cause problems with natural algae growth in the sewer systems because the herbicides kill the algae. In Jefferson County, a different farmer is using a very strong herbicide on his farmland to control weeds. His farmland is bordered by a creek, which feed into the Meramec River. In the Mark Twain Forest, lumber companies are clear-cutting entire hillsides for miles. When they are finished cutting, they leave the logs that cannot be sold on the ground.