'Time bomb' threatens lakes

Tuesday, August 12, 2008 A Danish water quality expert has warned that degradation of the country's lakes is likely to get worse because a "time bomb" of polluting nitrates exists in the ground.

Erik Jeppesen, from Denmark's National Environmental Research Institute, said years of intensive farming in New Zealand meant high concentrations of nitrogen and phosphorous would continue leaching into lakes and waterways for several decades yet.

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