Half of the world's wetlands have disappeared since 1900. Development and construction continue to pose major threats to wetlands, despite their value and importance.
Amartya K Saha
Wetlands disappear mainly because of artificial drainage to "reclaim" land for agriculture or to build on. If there is any wetland remaining in an urban area, or one that has been 'created', having a green buffer (natural vegetation that builds up a leaf litter horizon over time) can buffer the wetland against excess soil, oil and grease and chemical pollution from surface runoff following rain. stocking it with native fish also kickstarts the ecosystem processes of organic decomposition inside the wetland.
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