permaculture

["Lawrence F. London, Jr." <lflj@intrex.net>]

<http://news.bbc.co.uk/2/hi/science/nature/7525613.stm>
Page last updated at 16:36 GMT, Friday, 25 July 2008 17:36 UK
Rising demands threaten wetlands
By Mark Kinver
Science and nature reporter, BBC News

A man harvesting sugar cane (Getty Images)
Demand for biofuels could lead to wetlands being converted to farmland

The recent surge in demand for food and biofuel has increased the risks 
facing the world's wetlands, warn scientists.

A declaration by 700 scientists said the habitats faced a growing risk of 
being converted into farmland.

It also stated that the current knowledge of the extent of the world's wetlands was "unacceptable" and called for a 
global inventory to be set up.

The document was produced at the end of a UN-convened major scientific 
conference in Cuiaba, Brazil.

In their statement, the scientists highlighted other activities that were degrading the habitats, such as peat 
extraction and the construction of hydro-electricity dams.

"It is time to recognise the incalculable value of wetlands to all species - including ours," said Paulo Teixeira, 
co-chairman of the 8th Intecol International Wetlands Conference.

"If we don't plan and invest properly now, the cost to recreate artificially the services wetlands provide will dwarf 
the cost of preserving and protecting them in the first place."

In their declaration, the scientists called on the 158 countries that were party to the international wetlands 
agreement, known as the Ramsar Convention, to adhere to the global framework.

"Some countries have high standards for wetlands management, restoration and protection; however, many others are far 
behind," it said.

Fuelling the problem

They also warned against increasing farmland that encroached on the habitat, which caused damage through sediment, 
fertiliser and pesticide pollution.
Handful of corn (Image: AP)
There has been a boom in the number of farmers planting corn

"Biofuel production has led to a large loss of wetlands in the US already," explained Eugene Turner from Louisiana State 
University.

"They are now growing as much corn to produce biofuels as they used to export out 
of the country."

Professor Turner told BBC News that the surge in demand for the crop had resulted in agreements to conserve areas on the 
margins of farmland being broken.

"It is more profitable now to farm right up to the edge of a stream, so we are 
losing wetlands in the US from this alone."

"Of course, there are knock-on effects," he added. "If you do not grow the corn while the price is high, then somebody 
else is going to produce it - maybe on a key wetland site.

"This is an example of how interrelationships are not considered when we make 
decisions."

Carbon concerns

Another topic that was high on the conference agenda was the role the 
landscapes played in the global carbon cycle.

"Although that they may be 3-5% of the terrestrial surface, wetlands store about 20% of all terrestrial carbon, which 
amounts to 500-700 gigatonnes," explained Professor Turner.

"We are releasing, on a net basis, about 3.5 gigatonnes into the atmosphere, so any small change in the carbon from 
wetlands going into the atmosphere has a big impact."

He added that the future well-being of wetlands in the Arctic region was of 
particular concern.

"The places where it is going to proportionally warm the greatest is towards the Arctic; that region has an awful lot of 
wetlands.

"You put food in a refrigerator at home to keep it cool; if you don't, it 
begins to rot.

"The same thing applies in the Arctic," he explained. "The carbon is stored under the permafrost, meaning it is 
permanently frozen.

"The ice is receding, so the carbon that is stored there is going to be released 
and that is a problem."

SEE ALSO
Warming world 'drying wetlands'
http://news.bbc.co.uk/2/hi/science/nature/7513638.stm
22 Jul 08 |  Science/Nature
Call for regeneration of wetlands
http://news.bbc.co.uk/2/hi/uk_news/7492056.stm
06 Jul 08 |  UK
Methane rise points to wetlands
http://news.bbc.co.uk/2/hi/science/nature/7408808.stm
23 May 08 |  Science/Nature
Acres of Paraguayan wetland saved
http://news.bbc.co.uk/2/hi/science/nature/6257879.stm
12 Jan 07 |  Science/Nature
Brazilian wetlands 'under threat'
http://news.bbc.co.uk/2/hi/americas/4372545.stm
22 Mar 05 |  Americas
Iraq marshes' recovery 'in doubt'
http://news.bbc.co.uk/2/hi/science/nature/5295044.stm
30 Aug 06 |  Science/Nature

RELATED INTERNET LINKS
Intecol International Wetlands Conference
http://www.cppantanal.org.br/intecol/eng/index.php
UN University
http://www.unu.edu/
Louisiana State University
http://www.lsu.edu/

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