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米埔標誌:斑點魚郎

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科 學 家 及 居 民 正 面 臨 水 源 危 機
In Hong Kong, we often associate wetland conservation
with the conservation of wildlife, particularly waterbirds. Quite often,
we forget that wetland conservation also means the conservation of
one of the most important resources that suports human life, clean
drinking water. Here is a recent article about the unequal access to
clean drinking water for people in different parts of the world.
Source: E/The Environmental Magazine
By: Brian Howard
Date: Thursday, January 08, 2004
At the recent G8 summit in Evian, France, delegates
met to discuss, among other issues, how to provide safe drinking water
to the 1.5 billion of the world's citizens who live without it. Everyone
within the summit gates enjoyed the free and plentiful bottled mineral
water.
"It's obscene," says one journalist who attended the conference, held near
the source of one of the world's most famous bottled water brands. "How can
they not see that holding the summit in this place and talking about water
in Africa is tasteless? It's beyond comprehension."
In fact, although many people might agree philosophically
with Mikhail Gorbachev when he said, "Clean water is a universal human
right," the world is sharply divided in terms of access to safe hydration.
Those who can afford it are guzzling ever-increasing numbers of designer
water bottles, while half the world's population lacks basic sanitation
facilities, according to the United Nations (U.N.). Diseases caused
by unsanitary water kill five to 12 million people a year, most of
them women and children. A child dies every eight seconds from a preventable
water-borne disease.
Only one one-hundredth of one percent of the
blue planet's water is readily accessible for human use. The World
Resources Institute (WRI) estimates that 2.3 billion people currently
live in "water-stressed areas." Hydrologists cite much of Africa, northern
China, pockets of India, Mexico, the Middle East, and parts of western
North America as regions facing severe water shortages. Some of the
world's largest cities, including Mexico City, Bangkok, and Jakarta,
have severely over-pumped their groundwater aquifers.
As world population continues to increase, water
scarcity will affect two out of every three people by 2025, according
to UN estimates. In the 20th century, demand for fresh water grew twice
as fast as population. This imbalance is largely due to industrial
agriculture, but is also a product of unequal development in standards
of living versus sound water management.
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Additionally, scientists at Harvard University
point out that global warming could significantly harm water availability.
A warmer atmosphere could lead to higher rates of evaporation, causing
droughts and more severe weather. Faster runoff rates and slower infiltration
of groundwater could follow. Warmer water may also promote detrimental
algal and microbial blooms, which may lead to more water-borne illnesses.
And ironically, as the climate heats up, people will want to use more
water for drinking, bathing, and watering plants.
"The next world war will be over water,"
says Vice President Ismail Serageldin of the World Bank. Even now,
some competition is beginning to build between (and within) nations
over finite water resources. Egypt has watched warily as Ethiopia
has built hundreds of dams on the Nile. Syria and Iraq have squabbled
over water projects with Turkey, and some of Israel's many conflicts
with Jordan and the Palestinians have been over water issues. Botswana
raised a public outcry after Namibia announced emergency drought
plans to divert water from the Okavango River.
Certain regions of the United States, including
the Colorado and Rio Grande River Basins, also suffer ominous shortages.
Much of the West's integral agriculture, livestock, and recreation
industries have been seriously threatened by water scarcity, and the
region has endured catastrophic wildfire seasons. At the same time,
sprawling development is threatening critical watershed areas throughout
the world. Elizabeth Ainsley Campbell, executive director of the Nashua
River Watershed Association, warns, "Unless we become more proactive
in planning for growth and setting aside open space, our drinking water
will be increasingly vulnerable to pollution from fertilizers, insecticides,
fuel byproducts, and other chemicals associated with commercial and
residential development."
Groundwater is similarly under siege. Over-pumping
and rising sea levels have resulted in falling, and saltwater-invaded,
water tables. Initial remediation of the 300,000 contaminated groundwater
sites in the U.S. will cost up to $1 trillion over the next 30 years,
according to the National Research Council.
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Water scarcity is also a serious threat to natural
ecosystems. "Watersheds with the highest biological value, as measured
by the number of endemic bird and fish species, are also generally
the most degraded," says Carmen Revenga of the WRI. "Many biologically
rich watersheds, particularly in Southeast Asia and China, also have
high population densities, high levels of modified and irrigated land,
and high rates of deforestation, especially in tropical areas," she
says. In the United States, 37 percent of freshwater fish are at risk
of extinction, 51 percent of crayfish and 40 percent of amphibians
are imperiled or vulnerable, and 67 percent of freshwater mussels are
extinct or vulnerable to extinction.
Fleecing the Third World
In much of the Third World, municipal water
systems often serve only cities or primarily upper- and middle-class
residents - who typically pay very low fees for use - while recurrent
revenue problems inhibit increases or upgrades in service. As a result,
as Christian Aid journalist Andrew Pendleton puts it, "The only water
that is available to many poor people free of charge lies in festering
pools and contains killer diseases such as cholera." Pendleton continues, "If
poor parents want to ensure their children will not die as a result
of diarrhea, they must pay through the nose for water from private
vendors or tankers."
Some people in developing countries are increasingly
turning to bottled water to meet their daily needs, a red flag for
some critics. World consumption of bottled water is growing at seven
percent a year, with the largest increases in the Asia Pacific region.
U.S. News & World Report recently concluded, "The drive toward bottled
water and filters will, however, widen the gap between the haves and
have-nots."
For one thing, as Pendleton points out, poor people in need may
be charged more per gallon of clean water than those in developed nations.
Many families in Ghana spend 10 to 20 percent of their income on water.
Also, since many countries lack the infrastructure
to recycle used water bottles, the containers end up further polluting
the local water sources. In Nepal, for example, water bottles tossed
aside by trekkers have caused a serious litter problem, since the government
can't afford to cart them out of remote areas.
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Many activists have also protested aggressive
bottling operations in the developing world. In Brazil, Nestle offers
Latin Americans a brand of bottled water called Nestle Pure Life. But
as Paul Constance of the Inter-American Development Bank points out, "Though
it looks much like the bottled mineral water long offered in restaurants
and upscale supermarkets, Pure Life is different. It is drawn from
local water sources, has an aggressively low price, and is marketed
specifically 'to meet the needs of people who have daily difficulty
in access to quality water.'" One Pure Life bottling plant was established
on a popular and ecologically sensitive mineral spring, prompting fierce
opposition.
In Haiti's capital, Port-au-Prince, only 10
percent of homes have tap water, even though the local groundwater
reserves are thought to host enough capacity for every resident. The
public water system struggles from serious disrepair and a chronic
lack of funding. Recently, some entrepreneurs began drawing water from
a network of private wells and trucking it to tank owners, who then
sell the precious liquid to families at a huge profit. Constance says
it is not uncommon for "legal or illegal private providers to make
handsome profits by trucking or carting water into the poorest neighborhoods."
Many people have to carry water bottles great distances.
Clearly, the world is approaching a water crisis.
Watersheds and municipal systems must be secured from rising threats.
And some wonder if bottled water quenches human greed far better than
human thirst.
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