INTRODUCTION
Chapter 3. Signs of Stress: The Biological Base
Lester R. Brown, Eco-Economy: Building an Economy for the Earth
(W.W. Norton & Co., NY: 2001).
In April 2001, scientists at the National
Oceanic and Atmospheric Administration laboratory in Boulder, Colorado,
reported that a huge dust storm from northern China had reached
the United States, "blanketing areas from Canada to Arizona with
a layer of dust." People living in the foothills of the Rockies
could not even see the mountains. Few Americans were aware that
the dust on their cars and the haze hanging over the western United
States was, in fact, soil from China.1
This Chinese dust storm, the most severe of a dozen in the spring
of 2001, signals a widespread deterioration of the rangeland and
cropland in that country's vast northwest. These huge dust plumes
routinely travel hundreds of miles to populous cities in northeastern
China, including Beijingobscuring
the sun, reducing visibility, slowing traffic, and closing airports.
Reports of residents in eastern cities caulking windows with old
rags to keep out the dust are reminiscent of the U.S. Dust Bowl
of the 1930s.2
News reports in China typically attributed the dust storms to the
drought of the last three years, but that has simply brought a fast-deteriorating
situation into focus. Overgrazing and overplowing are widespread.
For example, the United States, a country of comparable size and
grazing capacity, has 98 million cattle and 9 million sheep and
goats, whereas China now has 127 million cattle and 279 million
sheep and goats. Feeding 1.3 billion people, a population nearly
five times that of the United States, is not an easy matter. Millions
of hectares of highly erodible land were plowed that should have
stayed in grass.3
Evidence of the intensifying conflict between the economy and the
ecosystem of which it is a part can be seen not only in the dust
bowl emerging in China, but also in the burning rainforests in Indonesia,
the collapsing cod fishery in the North Sea, falling crop yields
in Africa, the expanding dead zone in the Gulf of Mexico, and falling
water tables in India.
The ill-structured global economy's rising demands on ecosystems
are diminishing the earth's biological productivity. The output
of oceanic fisheries is reduced by overfishing, by oceanic pollutants,
and by disruptions of the reproductive cycle of river-spawning fish
as some rivers are dammed and others are drained dry. Overgrazing
of rangelands is also taking a toll. Initially overgrazing reduces
the productivity of rangelands, but eventually it destroys themconverting
them into desert.
The productive capacity of the earth's forests is declining as they
shrink by more than 9 million hectares per year. Lumbering, land
clearing for crop production or ranching, and firewood gathering
are responsible. Healthy rainforests do not burn, but fragmented
tropical rainforests can be weakened to where they are easily ignited
by lightning.4
An estimated 36 percent of the world's cropland is suffering a decline
in inherent productivity from soil erosion. If this continues, eventually
the cropland will become wasteland. In Africa, the failure to replace
nutrients removed by crops is reducing crop yields in several countries.
As local ecosystems deteriorate, the land's carrying capacity is
reduced, setting in motion a self-reinforcing cycle of ecological
degradation and deepening human poverty. With half the world's workforce
dependent on croplands, fisheries, rangelands, and forests for their
jobs and livelihood, any deterioration of these ecosystems can translate
into a decline in living conditions.5
ENDNOTES:
1. "China Dust Storm Strikes USA," NOAA News (National Oceanic and
Atmospheric Administration), 18 April 2001; Ann Schrader, "Latest
Import From China: Haze," Denver Post, 18 April 2001.
2. Dust storms in China from National Center for Atmospheric Research
(NCAR), "Scientists, Ships, Aircraft to Profile Asian Pollution
and Dust." press release (Boulder, CO: 20 March 2001); U.S. Dust
Bowl from William K. Stevens, "Great Plains or Great Desert? The
Sea of Dunes Lies in Wait," New York Times, 28 May 1996.
3. Livestock data from U.N. Food and Agriculture Organization (FAO),
FAOSTAT Statistics Database, , updated 2 May 2001.
4. Shrinkage of forests from FAO, Forest Resources Assessment (FRA)
2000, www.fao.org/forestry/fo/fra/index.jsp, updated 10 April 2001,
but see note in Chapter 8 on variations in estimates; information
on forest fires from Emily Matthews et al., Pilot Analysis of Global
Ecosystems: Forest Ecosystems (Washington, DC: World Resources Institute
(WRI), 2000), pp. 24-26.
5. Loss of topsoil calculated from Mohan K. Wali et al., "Assessing
Terrestrial Ecosystem Sustainability," Nature & Resources, October-December
1999, pp. 21-33, and from WRI, World Resources 2000-01 (Washington,
DC: 2000); yield from U.S. Department of Agriculture (USDA), Production,
Supply, and Distribution, electronic database, Washington, DC, updated
May 2001; jobs from WRI, op. cit. this note, p. 4.
Copyright
© 2001 Earth Policy Institute
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