The World Conservation Union (IUCN) defines the term peace park as an area “formally dedicated to the protection and maintenance of biological diversity, and of natural and associated cultural resources, and to the promotion of peace and co-operation.” Peace Parks constitute but one type of transboundary protected area (TBPA), which in turn is defined as: “An area of land and/or sea that

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Introduction

Surface water is precipitation that does not infiltrate into the ground or return to the atmosphere by transpiration or evaporation. It may be loosely defined as water that stands or flows on the surface of the Earth and is commonly referred to as runoff. The management of surface water is a complex issue,

Dr. Emmett Duffy is an ecologist and conservation biologist with expertise in marine biodiversity and its importance to human society. His research ranges from the field discovery and description of new coral-reef species, through experimental study of coastal and estuarine food web interactions, to collaborative efforts to quantify and publicize the role of marine […]

Over 8,000 plant species worldwide are threatened with extinction, according to the World Conservation Union, and that number grows daily. Researchers have recently estimated that between 22 and 47% of the world’s flora is in serious decline. In the United States alone, 744 plant species are federally listed as threatened or endangered by the U. S. Fish and Wildlife Service, comprising over half of all imperiled species.

An object’s kinetic energy can be classified as internal or external. For example, a falling coin has a certain external kinetic energy that is related to its overall mass and to its velocity as it falls. The coin is also composed of particles that, like all particles, are moving in a random way, independent of the overall motion (or position) of the coin.

Will the world’s seafood supply collapse by the middle of this century?
Worm et al. (2006) projected current trends in fishery catches and suggested that, if current practices continue unchanged, most fished species could be collapsed by 2048. Two points are important. First, the projection was a global average, and did not consider variation […]

Early 1900s
The industrial revolution came to the fishing industry with the introduction of steam-powered trawlers, which quickly replaced the schooner fleets. Fisheries scientists warned that the new technology should be applied judiciously, but this had little effect on fishing.
1960s
Ocean-going factory ships, which processed and refrigerated the catch and could remain at sea for long periods, […]

Uranium is a radioactive element that occurs naturally in low concentrations (a few parts per million) in soil, rock, and surface and groundwater. It is the heaviest naturally occurring element, with an atomic number of 92. Uranium in its pure form is a silver-colored heavy metal that is nearly twice as dense as lead and is pyrophoric when finely divided.

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