. . . "b; Lei Shen, assistant professor of statistics; Carl D. M...Scientists collaborate to assess health of global environment...arried out to meet demand for food, fiber, timber, fresh water, fuel and other resources has begun to jeopa...been degraded over the last 50 years--most notably fresh water, fisheries, air and water purification, and the regulation of climate, natural hazards and pes...Essent" . . . .