Software Charts Troubled Waters

摘要

It is difficult to even estimate the cost of progress. According to Barry Burgan, coordinator of the Environmental Protection Agency's National Water Quality Inventory, Washington, D.C., only a fraction of the rivers, lakes, wetlands, and ground water are sampled by the States. The EPA suggests that non-point sources of pollution, which by definition are diffuse or otherwise difficult to trace, are responsible for 50% of America's current water-pollution problems.