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By taking advantage of the work that
Christian Louboutin Evening healthy watersheds and freshwater ecosystems perform naturally, cities and rural areas can purify drinking water, alleviate hunger, mitigate flood damages, and meet other societal goals at a fraction of the cost of conventional technological alternatives, says Sandra Postel, Director of the Global Water Policy Project. But, says Postel in a new report from the Worldwatch Institute, commercial markets rarely put a price on these "ecosystem services." And because governments around the world are failing to protect them, they are being lost at a rapid rate. Global warming is the wild card that could further exacerbate the impacts of human activities on the natural systems that safeguard our water supply, she says. These
Jimmy Choo Sandals impacts include falling water tables,and sinking wetlands which lead to a decrease in both the quality and quantity of available freshwater. Pollution, population growth, and antiquated policies are contributing to the litany of serious impacts, Postel says. Water management methods in the twentieth century attempted to control and manipulate the hydrological cycle to best fit human needs with dams, diversions, levees, and reservoirs. While these engineering solutions help provide food, water, and electricity for many people, they have also severely disrupted the functioning of aquatic ecosystems. Key problems
jimmy choo The report singles out a number of key problems: Dam construction: Over 45,000 large dams now exist, up from 5,000 in 1950. Dams affect over half of the world's major river systems and more than three-quarters of large river systems in the United States, Canada, Europe, and the former Soviet Union. Dams contribute to species and habitat loss, deter fish migration, destroy natural flow patterns, and alter water temperature and nutrient and sediment transport. Pollution: Increasing amounts of fertiliser, pesticides, heavy metals, and synthetic chemicals are being
Christian Louboutin Sandals released into aquatic ecosystems, drastically altering the chemistry of lakes, rivers, and streams. These pollutants lessen the safety of drinking water, harm fish and wildlife,and lead to the spread of oxygen-depleted "dead zones." Use of nitrogen fertiliser, which has been implicated in the spread of these zones, has increased eightfold since 1960. Greenhouse gas emissions: Climate change linked to the buildup of carbon dioxide and other greenhouse gases in the atmosphere is expected to shift rainfall and runoff patterns, melt glaciers and shrink snowpacks, and increase the number and intensity of floods and droughts. Some of these trends appear to be under way already. Water factories
Jimmy Choo Sandals Rivers, lakes, wetlands, and other freshwater ecosystems provide a myriad of services that are essential to human well-being. "Healthy watersheds are nature's water factories, and it pays to protect them," says Postel. "Forests and wetlands can churn out high-quality water supplies at a lower cost than conventional treatment plants do, while providing many other valuable benefits at the same time, from recreational enjoyment to biodiversity conservation to climate protection." Prevailing water management systems are plagued by waste and inefficiency, placing unnecessary strain on natural water sources. It is common for cities to lose 20-50 per cent of their water to leaks and other problems in the distribution system. Taiwan, for example, loses nearly 2 million cubic metres of water a day to leakage - roughly equal to 325 million toilet flushes. Governments and utilities continue to spend taxpayer and customer
Christian Louboutin Wedges cash on expensive dams and treatment plants while a third or more of their existing supply is leaking away. "It almost seems as if the point of public policy is to liquidate Earth's water assets like a store going out of business," says Postel. By reducing waste and encouraging conservation, cities can leave more water in rivers and lakes, build fewer and smaller dams, pump less groundwater, and reduce the amount of energy and chemicals needed to treat and distribute their supply. Unfortunately, notes Postel, "in most cases, watershed protection remains the neglected stepchild of water supply systems, and conservation is relegated to drought-response at best."
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