Eutrophication caused by agricultural run off from nitrate fertilizers
shows algae blooms in a drainage ditch in Suffolk, England, UK.
Water pollution from agriculture is
costing billions of dollars a year in developed countries and is
set to rise in China and India as farmers race to increase food
production, the Organization for Economic Cooperation and
Development said.
“Pollution from farm pesticides and fertilizers is often
diffuse, making it hard to pin down exactly where it’s coming
from,” Kevin Parris, author of a report by the Paris-based
organization, said in an interview in Marseille. “In some big
agricultural countries in Europe, like parts of France, Spain
and the U.K., the situation is deteriorating.”
In some regions of China, pollution of waterways from
agriculture may already have reached a level that may cause
health problems in humans, he said.
The OECD report is part of a series of studies published
this week to coincide with the World Water Forum in Marseille.
Ministers, industry representatives and non-government
organizations are discussing resource management, waste, health
risks and climate change at the meeting. Pollution from farming
is gaining prominence as the global population increases,
raising demand for food and putting strain on water resources.
Fertilizers such as nitrates and phosphates as well as
pesticides that run off farms can contaminate drinking water,
harm aquatic life and result in eutrophication, or a
proliferation of plants that reduces oxygen content in water and
eliminates other sea life, according to the study.
Lakes at Risk
“The number of lakes at risk of harmful algal blooms will
increase by 20 percent in the first half of this century,” the
OECD said. By 2050 the nitrogen surpluses per hectare from
agriculture are forecast to drop in OECD member countries and
rise in China and India
Costs from agricultural pollution include money spent
treating water to remove nitrates, phosphates and pesticide
chemicals as well as paying farmers to store manure safely and
block contamination from reaching waterways, according to the
study. Environmental contamination such as algal blooms also
adds to the bill.
Beaches covered in green algae are becoming an annual
occurrence in Brittany, France’s westernmost region. The issue
pits the region’s 3.6 billion-euro ($4.7 billion) tourism
industry against its 8.2 billion-euro farming sector, whose
large quantities of animal waste and use of fertilizers are
blamed by scientists for feeding the so-called green tides that
form in Brittany’s shallow bays.
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