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… 3.4.2 Water pollution … 7.4.1 Water abstraction and drought … habitat which only covers an estimated 0.8% of the world’s surface area (Gleick 1996). 1.1.2 Major threats to freshwater … as exemplified by Lake Chad, which has shrunk from a surface area of 25,000 km2 in the early 1960s to around 1,350 …

… and widespread deterioration in the quality of air, water and soils – the basic resources on which all of life … the global population increases, less and less of Earth’s surface remains free from human interference. Human … 1993a). The rising water table brings salt to the soil surface and an estimated 62,500ha of land is going out of …

… ecosystem processes, and meet human needs, including water production, soil conservation, and marine nutrient … grazing by domestic animals, and hunting; and 6) surface water and rain quality (for example, sediment load. … the protected areas. Indeed, the bulk of the Earth’s surface is not in protected areas. This means that the future …

… many years through the joint management of the lake and water resources. Towards the end of the Communist period, … and individual erratic massifs. On the other hand, the surface has been intricately transformed by glaciations, … prairie lake in Europe. More than half of the lake’s surface is covered by reed bed which is an important habitat …

… areas too small to allow them to find adequate food, water, mates, or refuge from predators. As habitats continue … connections between habitats. Corridors provide land or water pathways that link protected areas with one another, … in 1994. Although covering only 0.5% of the world’s land surface, Mesoamerica is home to about 7% of the planet’s …

… a series of relationships between large marine ecosystems, water- sheds, national boundaries, and regional ocean … predators are removed that feed on algae attached to the surface of corals, allowing algal growth to smother the … assessment of organic car- bon accumulation in surface coastal sediments; changes in plankton community …