The need for a volume dealing with the concept of indicator organisms became evident during a symposium on the subject, organized by the present editors for the Southern California Academy of Sciences. Ques tions were posed about the appropriate uses of indicator organisms and the "rules" governing the application of the indicator concept to particular problems. For example, how does one distinguish true indicators from biological anomalies? What kinds of organisms can appropriately be associated with conditions and events at various scales in time and space? To what extent does one species represent other species in the same environmental setting? Can the indicator concept be applied to the context of modern sampling and analytical technology? How can anthropogenic perturbations be distinguished from natural phenomena? How can unlike matrices from differing data bases with differing scales best be matched? Such questions are especially pertinent in today's research environment. The use of indicator organisms, while certainly not new, is the corner stone for much scientific research. In the past two decades, indicator organisms have played increasingly important roles in the development and implementation of public policy. In particular, indicator organisms are being used to describe local environments and natural or anthropogenic perturbations to them, although there are pitfalls and problems associated with those usages. A growing number of nonbiologists, including physical oceanographers, find indicator organisms helpful, and sometimes essential, to their re search."

Long embraced by corporations who are driven only by the desire for profit, industrial agriculture wastes precious resources and spews millions of tons of greenhouse gases into the atmosphere each year, exacerbating climate change and threatening the very earth and water on which we depend. However, this dominant system, from which Americans obtain most of their food, is being slowly supplanted by a new paradigm.

"The Emergent Agriculture" is a collection of fourteen thematic essays on sustainability viewed through the lens of farming. Arguing that industrial food production is incompatible with the realities of nature, science, and ethics, this lyrical narrative makes the case for a locally based food system which is:

• Stable in the face of economic uncertainty
• Resilient in the face of environmental variability
• Grounded in stewardship of the land, on attaching value to food and the craft involved in producing it, and on respecting the dignity of farmers, consumer, s and livestock

A revolution in food production is underway. Written from the vantage point of an ecologist who is also a farmer, "The Emergent Agriculture" is essential reading for anyone interested in food security and the potential for growing local economies. Food for thought about the future of food.

Gary Kleppel is a professor of biology at the SUNY Albany, where he focuses on sustainable agriculture, conservation-based grazing, and the ecology of human-dominated landscapes. He and his wife Pam are owners of Longfield Farm, where they produce grass-fed lamb, wool, free range chickens and eggs, and artisanal breads.