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== Eksterne henvisninger ==
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* [http://www.sciencedaily.com/releases/2003/11/031126065513.htm 2003-11-27, Science Daily: Global Wetlands Surveyed From Space] Citat: "...Studies of wetlands show they store and purify water for domestic use, recharge natural aquifers as they run low, retain nutrients in floodplains, help control flooding and shore erosion and regulate local climate..."
* [http://www.sciencedaily.com/releases/2008/05/080507105549.htm Iowa State University (2008, May 8). Ponds Found To Take Up Carbon Like World's Oceans. ScienceDaily. Retrieved May 8, 2008] Citat: "..."Aquatic ecosystems play a disproportionately large role in the global carbon budget," Downing said...The combined effect is that farm ponds could be burying as much carbon as the world's oceans, each year...It may be that ponds will be the modern equivalent of the swamps that formed coal in the past. But before we all rush into making ponds to trap carbon we need to do some basic research here in the UK..."
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