The article presents solutions to environmental problems that several experts think will keep key environmental processes within acceptable thresholds including a discussion by professor of environmental science Gretchen C. Daily of Stanford University on how to stop biodiversity loss, a discussion by professor of ecology and environmental biology Robert Howarth of Cornell University on the ways to reduce negative impacts from a human-altered nitrogen (N) cycle, and a discussion by the director of civil, environmental and ocean engineering David A. Vaccari of the Stevens Institute of Technology on the sustainable flow of phosphorus through the environment.