Aquaculture is a fast-growing segment of the world food economy and a leading vector of aquatic invasive species in the United States and abroad. Surprisingly, little national or international oversight exists even for deliberate introductions of exotic species in aquaculture. The authors of this Policy Forum propose a policy agenda on exotic introductions as aquaculture expands that includes scientific risk assessment for all nonnative introductions and single-agency oversight for the prevention, containment, and monitoring of ecologically harmful species.

The overall effects of policy reforms enacted during the 1990s in Mexico on financial and economic profitability of Yaqui Valley agriculture are assessed in this study, which describes the reforms,examines how exogenous shocks affected the reform process,and documents how rural people and institutions adjusted to the changed circumstances. Virtually all of the reforms affected Yaqui Valley farmers because of the commercial character of their agriculture (relatively large, irrigated wheat farms), their close proximity to the US,and the new "openness" of Mexico's economy. By almost any standard,the reforms were both wide-ranging and successful, at least as measured in efficiency terms, yet the Yaqui Valley's rural communities face significant challenges at the start of the 21st century. The ejido communities have lost cohesiveness and even larger-scale farmers in the private sector face serious income problems. More generally, farmers have yet to find profitable new production systems, including the associated marketing institutions, which are consistent with greater reliance on world agricultural prices and diminished dependence on explicit and implicit subsidies from the government.

The Evolving Sphere of Food Security seeks to answer two important questions: How do the priorities and challenges of achieving food security change over time as countries develop economically? And how do the policies used to promote food security in one country affect nutrition, food access, natural resources, and national security in other countries? The volume presents the many faces and facets of food security—their symptoms, their roots, and their possible remedies—through the lens of a multidisciplinary group of scholars. The authors share personal stories of research and policy advising from their field experiences to provide readers with a real-world sense of the opportunities and challenges involved in promoting food security at local to global scales. Their observations from countries around the world demonstrate how food security is tied to security of many other kinds: energy, water, health, climate, the environment, and national security. The book’s main goal is to connect these areas in a way that tells an integrated story about human lives, resource use, and the policy process—a story about global food security.

Prior to the 2000 election The Aspen Institute convened a distinguished group of science, business, and environment leaders as a hypothetical committee to advise the new President on global environmental policy. Experts prepared this set of policy memos to tell the President, concisely and in understandable language, "what he should know" and "what he should do" about climate change, biodiversity, population, oceans, water, food and agriculture, and other problems. A thematic summary of the groups conclusions, written by Co-chairs Donald Kennedy of Stanford University and Roger Sant of the AES Corporation, communicates the urgency of the challenges, the complexity of the interrelated issues, and the optimism necessary to tackle them.

(excerpt) The group of science, environment, and business leaders who produced and discussed these memoranda share a strong conviction that you and your administration face an array ofhistoric and urgent challenges—the kind that, with bold leadership, can be turned into exceptional opportunities.

Many of the recommendations for specific areas involve policies and tools that will not slow the nation’s economy and may even provide economic opportunities and help resolve real humanitarian concerns. This article presents a sketch ofthe broad outlines ofthe environmental problems confronting humanity and suggests some paths toward their resolution.

The first two challenges, emerging into the public consciousness only in recent decades,are rooted in the unprecedented pace ofglobal change. The global economy is linking nations and people in new and different ways. But people  are only beginning to realize the extent to which human actions are radically reshaping the global environment. Without awareness of the consequences of these actions, people have taken control ofthe planet.

Global production of farmed fish and shellfish has more than doubled in the past 15 years. Many people believe that such growth relieves pressure on ocean fisheries, but the opposite is true for some types of aquaculture. Farming carnivorous species requires large inputs of wild fish for feed. Some aquaculture systems also reduce wild fish supplies through habitat modification, wild seedstock collection and other ecological impacts. On balance, global aquaculture production still adds to world fish supplies; however, if the growing aquaculture industry is to sustain its contribution to world fish supplies, it must reduce wild fish inputs in feed and adopt more ecologically sound management practices.

Earth Systems: Processes and Issues is the ideal textbook for introductory courses in earth systems science and environmental science. Integrating the principles of the natural sciences, engineering, and economics as they pertain to the global environment, it explains the complex couplings and feedback mechanisms linking the geosphere, biosphere, hydrosphere, and atmosphere. An impressive group of internationally respected researchers and lecturers have brought together a vast wealth of teaching experience to produce this fully integrated environmental textbook. It has been designed for the wide range of courses at the first-year university level which touch upon environmental issues: in earth and atmospheric science, environmental science, biological science, oceanography, geography, civil engineering, and social science. Each chapter includes a reading list of the most important references, and problem sets will encourage students to explore the subject further. This text will favorably influence the future development of environmental studies and earth system science.