From: Subject: =?Windows-1252?Q?news_@_nature.com=A0-=A0Deserts_set_to_expand=A0-=A0Worl?= =?Windows-1252?Q?d's_poorest_must_change_lifestyles_as_Earth_dries_up.?= Date: Tue, 21 Jun 2005 16:48:19 -0500 MIME-Version: 1.0 Content-Type: multipart/related; type="text/html"; boundary="----=_NextPart_000_0130_01C57681.078AE8D0" X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.2180 This is a multi-part message in MIME format. ------=_NextPart_000_0130_01C57681.078AE8D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Content-Location: http://www.nature.com/news/2005/050613/full/050613-7.html news @ = nature.com=A0-=A0Deserts set to expand=A0-=A0World's poorest must change = lifestyles as Earth dries up.
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Published online: 16 = June 2005; |=20 doi:10.1038/news050613-7

Deserts set to expand

Michael=20 Hopkin
3D""=20
World's poorest=20 must change lifestyles as Earth dries up.
3D""=20
3D""=20
3D""=20
3D""=20
3D""=20

Dunes are encroaching on = cities in=20 many of the world's poorest = countries.

=A9 Nature/ Nicola=20 = Jones
Many of the world's dry = regions,=20 currently home to some 2.1 billion people, are in danger of = becoming=20 useless for growing food, according to the latest in a = series of=20 reports on the world's ecosystems. It blames climate change = and=20 human activities.

The report's authors estimate = that 10-20%=20 of these 'drylands' have already lost some plant life or = economic=20 use, and they say the situation is getting worse. Hundreds = of=20 thousands of people will be in need of new homes and = lifestyles over=20 the next 30 years, they estimate.
The report, = titled=20 Ecosystems and Human Well-Being: Desertification=20 Synthesis1,=20 is the third in a series of seven detailing the findings of = the=20 Millennium Ecosystem Assessment, a four-year, US$22-million=20 stocktake of the world's biological resources.
The=20 assessment aims to compile all of the available data from = previous=20 studies to give the most accurate picture yet of the = condition of=20 the world's ecosystems. In the case of drylands it = highlights the=20 lack of knowledge about these regions, which cover 41% of = the=20 planet's land surface. They include everything from the=20 'dry-sub-humid' regions of eastern Mediterranean croplands, = to=20 full-blown 'hyper-arid' deserts such as the = Sahara.
3D""=20 Desertification has = emerged as an=20 immense global problem that affects a lot = of=20 people. 3D""=20

Zafar=20 Adeel
United Nations=20 University International Network on Water, = Environment and=20 = Health
 3D""=20
3D""=20
"There are serious gaps in our understanding of = how big=20 deserts are, and how they are growing," says Zafar Adeel, = assistant=20 director of the United Nations University International = Network on=20 Water, Environment and Health in Hamilton, Canada, and one = of the=20 report's main authors.

What is clear, however, is = that deserts=20 are getting bigger. "Desertification has emerged as an = immense=20 global problem that affects a lot of people," Adeel says. = Dust=20 storms from the Gobi Desert in Asia and the African Sahara = are=20 responsible for respiratory problems as far afield as North = America,=20 the report says.

Fields of = dreams
Perhaps the=20 biggest problem, however, is that as land dries up it = becomes=20 unsuitable for farming. The problem is worsened by the fact = that=20 many of the areas at greatest risk, such as central Asia and = regions=20 to the north and south of the Sahara, are home to the = world's=20 poorest people. "Without strong efforts to reverse = desertification,=20 some of the gains we've seen in development in these regions = may be=20 reversed," Adeel says.

The report's release comes = ahead of the=20 World Day to Combat Desertification on 17 June. This day = marks the=20 11th birthday of a United Nations agreement, signed by 191=20 countries, to tackle the expansion of deserts. But, says = Adeel,=20 previous efforts have been hampered by ignorance of the = scale of the=20 problem.

ADVERTISEMENT
Solutions=20 should be tailored to individual countries' situations, the = authors=20 recommend. They hope that governments of countries at risk = of drying=20 up will promote 'alternative livelihoods' that protect dry=20 regions.

This could involve investment in ecotourism = rather than=20 farming, Adeel suggests. Other possibilities involve = embracing solar=20 power, or farming fish rather than irrigating crops, which = turns out=20 to be a more efficient way of wringing food and money from a = limited=20 amount of water.

Walter Reid, director of the = Millennium=20 Ecosystem Assessment, estimates it might take US$100 billion = to=20 invest properly in dryland areas. "That's substantial. But = relative=20 to other areas where public money is spent it's not such a = big=20 deal," says Reid.

3D""=20 3D""=20 To= p
3D""=20
3D""=20
3D""=20
References
  1. Millennium Ecosystem = Assessment.=20 Ecosystems and Human Well-Being: Desertification=20 Synthesis, Available at http://www.inweh.unu.edu/
    inweh/MA/Desertification-Synth= esis.pdf=20 (2005).
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To=20 receive all the daily news in your inbox = each=20 week, sign up for our email = alert=20 here:
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