(Jun 19, 2007)


WWF warns desalinization could contribute to climate change



From AP


GENEVA (AP) - Extracting salt from seawater to make it drinkable is the wrong way to handle water shortages around the world and could exacerbate climate change, a leading conservation group said Tuesday.

Desalination uses large amounts of energy, emits greenhouse gasses and destroys marine life in some coastal areas, the World Wide Fund for Nature said.

''The rate of building these desalination plants seems to be growing exponentially,'' said Jamie Pittock, who heads WWF's freshwater program. ''If that continues ... greenhouse gas emissions would accelerate and increase climate change dramatically,'' he told The Associated Press.

WWF estimates that there are about 1,000 desalination plants around the world, Pittock said, adding that it was difficult to obtain good data.

Desalination has become a growing trend particularly in Australia, the Middle East, Spain, the United Kingdom, the United States, India and China, the report said.

The Persian Gulf meets an estimated 60 percent of its drinking water needs through desalination. Perth in Australia is looking to cover one-third of its freshwater demand through desalination.

In Spain, 22 percent of the desalinated water is used for agriculture, according to the 52-page document.

Making more drinking water with the help of desalination plants ''creates a wasteful attitude to water use,'' said Pittock, adding that in most cities vast amounts of water are wasted.

People should set up more water-effective technologies in houses and businesses, reduce the leakage in pipes and recycle waste water, he said. ''In most cities desalination plants are not required.''

Marine life is put at risk by desalination plants, the report said. As the seawater is taken in, small life forms such as plankton, eggs and fish larvae are also removed.

The brine _ the highly concentrated saline water _ discharged from the plants is mostly sent back into the sea where it increases the salinity of the water, posing a threat to sea life and disrupting the ecosystem.

In the United States, some states such as California and Florida that are short of water, plan large desalination plants in enclosed sea areas, Pittock said. The saline discharge from plants in enclosed areas such as Monterey Bay in California can destroy sea grass and kill fish, he added.

Seawater desalination should be limited to places where no better solution can be found, the report said.

''There needs to be a thorough assessment whether these plants are really needed,'' Pittock said.

Ger Bergkamp, who heads the water program at The World Conservation Union _ known under its acronym IUCN _ said the problem with desalination plants is much more the negative impact on the ecosystem than greenhouse gas emissions.

''The number of desalination plants that exist is so small that their contribution in emissions is at this point in time still minute,'' Bergkamp told the AP.

Instead of opposing a technology that could help many countries out of their water crisis, it would be better to find ways how it can be improved, he said.

Desalination plants could be made more energy-efficient and powered by renewable energies, he added.

Looking into ways to discharge the brine far enough from the coast so that it can dilute or finding alternative uses for the saline discharge in other industrial processes might minimize the environmental impact, said Bergkamp.


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