Every day brings news of human beings’ impact on the life-support system known as Earth. But what is the truth behind the headlines? In 1999, an international group of more than 70 scientists analyzed the condition of the five ecosystems on which all life most heavily depends — freshwater, agriculture, forests, grasslands, and coastal ecosystems. Their findings are the scientific basis for Earth on Edge, which premiered on PBS June 19th, 2001 at 8 P.M. The program presents the findings of scientists who are studying the health of our world, as well as stories of ordinary people working to restore the health and well-being of the ecosystems they — and ultimately all of us — depend on.