River of History


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Salt River Project


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Bulletin of the Atomic Scientists


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The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhattan Project Scientists, the Bulletin's iconic "Doomsday Clock" stimulates solutions for a safer world.




Emergency Conservation Work


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Vanishing Phoenix


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Lost, a Desert River and Its Native Fishes


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The Colorado River had one of the most unique fish communities in the world. Seventy-five percent of those species were found nowhere else in the world. Settlement of the lower basin brought dramatic change to both the river and its native fish. Those changes began more than 120 years ago as settlers began stocking nonnative fishes. By 1930, nonnative fish had spread throughout the lower basin and replaced native communities. All resemblance of historic river conditions faded with the construction of Hoover Dam in 1935 and other large water development projects. Today, few remember what the Colorado River was really like. Seven of the nine mainstream fishes are now Federally-protected as endangered. Federal and state agencies are attempting to recover these fish. However, progress has been frustrated due to the severity of human impact. This report represents testimony, old descriptions, and photographs describing the changes that have taken place in hopes that it will provide managers, biologists, and the interested public a better appreciation of the environment that shaped these unique fish.




Colorado River Basin Water Management


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Recent studies of past climate and streamflow conditions have broadened understanding of long-term water availability in the Colorado River, revealing many periods when streamflow was lower than at any time in the past 100 years of recorded flows. That information, along with two important trends-a rapid increase in urban populations in the West and significant climate warming in the region-will require that water managers prepare for possible reductions in water supplies that cannot be fully averted through traditional means. Colorado River Basin Water Management assesses existing scientific information, including temperature and streamflow records, tree-ring based reconstructions, and climate model projections, and how it relates to Colorado River water supplies and demands, water management, and drought preparedness. The book concludes that successful adjustments to new conditions will entail strong and sustained cooperation among the seven Colorado River basin states and recommends conducting a comprehensive basinwide study of urban water practices that can be used to help improve planning for future droughts and water shortages.




Surviving Sudden Environmental Change


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Archaeologists have long encountered evidence of natural disasters through excavation and stratigraphy. In Surviving Sudden Environmental Change, case studies examine how eight different past human communities—ranging from Arctic to equatorial regions, from tropical rainforests to desert interiors, and from deep prehistory to living memory—faced, and coped with, such dangers. Many disasters originate from a force of nature, such as an earthquake, cyclone, tsunami, volcanic eruption, drought, or flood. But that is only half of the story; decisions of people and their particular cultural lifeways are the rest. Sociocultural factors are essential in understanding risk, impact, resilience, reactions, and recoveries from massive sudden environmental changes. By using deep-time perspectives provided by interdisciplinary approaches, this book provides a rich temporal background to the human experience of environmental hazards and disasters. In addition, each chapter is followed by an abstract summarizing the important implications for today’s management practices and providing recommendations for policy makers. Publication supported in part by the National Science Foundation.