Fri Nov 30, 2012, 08:42 AM
hatrack (37,067 posts)
Study - In Past 100 Years, Humans Have Destroyed Half The Planet's Wetlands - Mongabay
Half of the worlds wetlands have been destroyed in just the last 100 years, says a new report. Published by the Economics of Ecosystems and Biodiversity (TEEB), the report found that of the 25 million square kilometers of wetlands that existed in 1900 just 12.8 million square kilometers now remain. The rate of destruction varies geographically with notable loses in East Asia running at 1.6 per cent per year. In places where aquaculture, over-exploitation (e.g. unsustainable harvesting of fish) and storm damage have been severe, the rate of destruction can be as high as 80 percent.
"There is an urgent need to put wetlands and water-related ecosystem services at the heart of water management in order to meet the social, economic and environmental needs of a global population predicted to reach 9 billion by 2050," said Achim Steiner, UN Under-Secretary General and UN Environment Programme Executive Director, in a press statement.
Wetlands play a key role in supporting human life. They help regulate the water cycle, act as carbon sinks, offer protection from floods and storms, regulate sediment transport and contribute to land formation and coastal stability.
Wetlands also deliver a range of services and benefits much more cheaply than man-made infrastructure. In the United Kingdom for example, wetlands have been found to make cost savings of up to £0.71 million per hectare in terms of sea defense. In the United States, the Mississippi River Delta provides at least $12-47 billion in benefits to people every year in terms of hurricane and flood protection, water quality improvements and recreation. As some of the world's most biodiverse areas, wetlands supporting a quarter of global biological productivity. This high productivity means they are also an ideal setting for industry: ninety percent of the fish landed globally comes from coastal ecosystems, for example.
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