Geometry.Net - Science: Desertification

Tiempo Climate Cyberlibrary, Tiempo - Issue 9, Desertification And Climate Chang
desertification and climate change. If a humid area converts to subhumid, thenthe potential area within which desertification may occur will increase.
http://www.cru.uea.ac.uk/tiempo/floor0/archive/issue09/t9art1.htm

Extractions: Return to features index Desertification and climate change Mick Kelly and Mike Hulme address the complex and often uncertain links between climate change, prolonged aridification or desiccation, and desertification. They pay particular attention to the case of the African Sahel. The authors are staff members of the Climatic Research Unit at the University of East Anglia (Norwich, UK). The definition of desertification adopted by the United Nations Conference on Environment and Development in 1992 is land degradation in arid, semi-arid and dry sub-humid areas resulting from various factors including climatic variations and human activities. This definition cites climate variation as a direct causal factor and it implicitly links climate change and the assessment of the extent of desertification. Since arid, semi-arid and dry sub-humid areas are climatically defined, any change in climate which results in an expansion or contraction of these areas will alter the extent of the area in which desertification can be considered to occur. For example, if an arid area converts to hyper-arid because of climate change, then the area in which desertification may occur will decrease. Hyper-arid areas are not included in the accepted definition. If a humid area converts to sub-humid, then the potential area within which desertification may occur will increase.
Sunseed Trust / Sunseed Desert Technology - Research And Design For
Aims to improve the quality of life and of environment of people living in arid, neardesert areas of the world, by researching desertification and appropriate technologies.
http://www.sunseed.org.uk/
Desertification
desertification Centre For Earth Observation (CEO) desertificationInformation Network. desertification (from UNEP/GRID Sioux Falls).
http://www.lib.kth.se/~lg/desert.htm

Extractions: Desertification Centre For Earth Observation (CEO) - Desertification Information Network Desertification (from UNEP/GRID Sioux Falls) Desertification in the Mediterranean - Resources Fact sheets on the Convention to Combat Desertification The FAO Web Site on Desertification Grassroots Indicators for Desertification Experience and Perspectives from Eastern and Southern Africa (Edited by Helen Hambly and Tobias Onweng Angura, 1996. 180 pp.) Information Sharing Segment, First Substantive Session, Intergovernmental Negotiating Committee for a Convention to Combat Desertification The Italian Clearing House on Desertification The Land Degradation and Desertification Website (The Working Group on Land Degradation and Desertification of the International Union of Soil Sciences) Mediterranean Desertification and Land Use 1991-1999 A Research Project on Changes in Arid Mediterannean Ecosystems on the Long Term and Earth Observation RIOD: The International NGO Network on Desertification and Drought United Nations Convention to Combat Desertification ... Web resources on desertification, part II (Compiled and annotated by Katherine Waser)
TPE Sur La Désertification : F. BIETH Et G. PERRIN
Les causes et cons©quences de la d©sertification des d©serts du Sahara et du Sahel et les solutions envisag©es. Travail personnel encadr©.
http://membres.lycos.fr/desertification
Desertification Information Network Of China
desertification is one of the major environmental issues in the world today. TheUN Convention to Combat desertification (CCD) was opened for signing in Oct.
http://www.din.net.cn/

Extractions: Desertification is one of the major environmental issues in the world today. At present, two third of the countries and districts in the world, one fourth of the global land territory and nearly 100 million world population are threatened by desertification. China is one of the countries with serious disasters of desertification in the world. According to the monitoring results of China's State Forestry Administration in 1999, the desert areas are still expanding in China with an average increase of about 10,400 square kilometers per year, and China has 2.67 million square kilometers of desert land, accounting for 27.9 percent of China's total territory, The UN Convention to Combat Desertification (CCD) was opened for signing in Oct. 1994 in Paris and Chinese Delegation has signed the CCD on behalf of the Government of China. On December 30th 1996, the Outstanding Committee of the People's Congress has ratified the CCD and China has become officially the member state of the parties of CCD.
Desert.html
desertification. In the anomaly case, the troposphere is cooler across most of thetropics and subtropics, including all areas where desertification occurs.
http://grads.iges.org/res/proj10/proj10.html
The Nubian Sandstone Aquifer System
Cooperative multinational program to foster cooperation in groundwater studies and development, environmentally sound, agricultural and agropastoral development, restoration of disrupted ecological balance, and combating desertification (Egypt, Libya, and Sudan).
http://isu2.cedare.org.eg/nubian/

Extractions: The Nubian Sandstone Aquifer System (NSAS) is a huge groundwater resource shared among four countries within the Eastern Sahara in North-East Africa. These countries are Chad, Egypt, Libya and Sudan. The NSAS underlies an area in excess of 2.5 million km . It occupies a portion of the great arid zone belt of North Africa, extending northward into the Mediterranean Steppe and merging on the southern side into the subtropical climatic zone. The NSAS is a non-renewable resource. Its unrestricted development and utilisation would be tantamount to depletion of the water resource in the long term. This does not imply that groundwater development cannot take place or should be limited to the present recharge. Under the scarcity conditions of water in the region, which it is an overwhelmingly important constraint to the development of the rural economies, there is considerable scope for utilising this resource provided its use is governed by principles of economic rationality and sustainable development. Within this context, the "Programme for the Development of a Regional Strategy for the Utilisation of the Nubian Sandstone Aquifer System" was initiated to build up a vision for the sustainable management of this resource for the good of the coming generations. The area occupied by the Aquifer under study by this Programme, is 2.2 million km
ThinkQuest Library Of Entries
desertification is the expansion of desert lands into previously nondesertareas. desertification at Work. Photo Credit Olafur Arnalds.
http://library.advanced.org/26026/Science/desertification.html

Extractions: The web site you have requested, The Environment: A Global Challenge , is one of over 4000 student created entries in our Library. Before using our Library, please be sure that you have read and agreed to our To learn more about ThinkQuest. You can browse other ThinkQuest Library Entries To proceed to The Environment: A Global Challenge click here Back to the Previous Page The Site you have Requested ... click here to view this site Click image for the Site Awards Received Languages : Site Desciption "The Environment: A Global Challenge" is a comprehensive site providing information on many aspects of the environment. There are 400 articles in twelve content sections [ Current Events, Economics, Environmental Problems, Health Concerns, History, Organizations, Science, Statistics and World Outlook]. Articles are interlinked and multimedia and links to outside information often accompany the text. Integrated into each content section and spread out through various other sections are many interactive features, such as simulations, interviews, streaming multimedia, a scientific experimentation center, and systems for adding links and new content enable visitors to experience what they are learning about. Educators can easily and instantly involve their entire class in the site by creating accounts in our Classroom Connection database.
Aral Sea Desertification
Abstract. Characteristics of the Aral Sea desertification caused by an irrigationpolicy was discussed from the view point of landscape ecology.
http://rosa.envi.osakafu-u.ac.jp/~yuki/aral.html

Extractions: Yukihiro Morimoto (*) , Atsuo Morimura (**) and Natalia Ogar(***) Characteristics of the Aral Sea desertification caused by an irrigation policy was discussed from the view point of landscape ecology. (1) General concepts of vegetation distribution including geobotanical zoning, (2) landscape mosaics in delta vegetation, (3) relationship between traditional and modern land use and natural conditions, and (4) vegetation changes caused by massive irrigation in the arid areas of Middle Asia were discussed.
Desertification
desertification is the process which turns productive into non productivedesert as a result of poor land-management. WHAT CAUSES desertification?
http://www.botany.uwc.ac.za/Envfacts/facts/desertification.htm

Extractions: Desertification is the process which turns productive into non- productive desert as a result of poor land-management. Desertification occurs mainly in semi-arid areas (average annual rainfall less than 600 mm) bordering on deserts. In the Sahel, (the semi-arid area south of the Sahara Desert), for example, the desert moved 100 km southwards between 1950 and 1975. WHAT CAUSES DESERTIFICATION? * Overgrazing is the major cause of desertification worldwide. Plants of semi-arid areas are adapted to being eaten by sparsely scattered, large, grazing mammals which move in response to the patchy rainfall common to these regions. Early human pastoralists living in semi-arid areas copied this natural system. They moved their small groups of domestic animals in response to food and water availability. Such regular stock movement prevented overgrazing of the fragile plant cover. In modern times, the use of fences has prevented domestic and wild animals from moving in response to food availability, and overgrazing has often resulted. However, when used correctly, fencing is a valuable tool of good veld management.
Desertification Information Network
The objective of the network is to provide data and information services on the subject of desertification, particularly in African and the Mediterranean basin.
http://www.wcmc.org.uk/dynamic/desert/index.html
Desertification
desertification The degradation of soil, forest, water, animal andplant resources is becoming increasingly common. The results
http://www.sdgateway.net/topics/87.htm

Extractions: Member Links Other Links Member Links Other Links Food and Argriculture Organization - Desertification Grassroots Indicators for Desertification (IDRC) Sustainable Development Networking Programme (India) United Nations Development Programme- Office to Combat Desertification and Drought (UNSO) ... United Nations Secretariat of the Convention to Combat Desertification
Desertification - Wikipedia
desertification. desertification is land degradation in arid, semiaridand dry sub-humid areas arising mainly from human activity.
http://www.wikipedia.org/wiki/Desertification

Extractions: Main Page Recent changes Edit this page Older versions Special pages Set my user preferences My watchlist Recently updated pages Upload image files Image list Registered users Site statistics Random article Orphaned articles Orphaned images Popular articles Most wanted articles Short articles Long articles Newly created articles All pages by title Blocked IP addresses Maintenance page External book sources Printable version Talk Log in Help From Wikipedia, the free encyclopedia. Desertification is land degradation in arid, semi-arid and dry sub-humid areas arising mainly from human activity. Modern desertification arises from the demands of increased populations that settle on the land in order to grow crops and graze animals. Desertification is widespread in many areas of China . The populations of rural areas have increased since for political reasons as more people have settled there. While there has been an increase in livestock, the land available for grazing has decreased. Also the importing of European cattle such as Fresian and Simmental, which have higher food intakes, has made things worse.
Land Degradation | World Soil Resources | NRCS
International Union of Soil Sciences working group site offers conference reports, technical papers and links to other organizations.
http://www.nrcs.usda.gov/technical/worldsoils/landdeg/index.html

Extractions: Agronomy, Wind and Water Erosion Air Quality Conservation Practices ... Wildlife Biology AGENDA 21 of the United Nations Conference on Environment and Development emphasizes the need and proposes a wide range of activities to address land degradation in general and desertification in particular. As a response to this challenge, more than 100 countries have signed the Convention to Combat Desertification (CCD) in 1997. A key point of the CCD deals with scientific and technical cooperation on investigation, collection, evaluation of the processes and factors involved in land degradation leading to desertification. At the conclusion of the Conference on Land Degradation at Adana, an International Task Force on Land Degradation, to be formed under the auspices of the International Union of Soil Sciences (IUSS), was proposed and unanimously adopted. Plato: Attica (Athens) was no longer cultivated by true herdsmen, who made husbandry their business, and were lovers of honor, and of a noble nature. As a result Attica had become deforested, the soils depleted, and there are remaining only the bones of the wasted body all the richer and softer parts of the soil having fallen away.
Combatting Desertification : Desertification
desertification is more than an encroaching desert! It degradation. Theconsequences of desertification also vary from place to place.
http://www.acdi-cida.gc.ca/cida_ind.nsf/vall/05633A876C55D09C852569A60080FA70?Op
Observatoire Sahara Et Sahel, Sahel And Sahara Observatory
Details about mission, objectives and structure of OSS, an organization striving to build up an African arena for cooperation and exchange to combat desertification and poverty. Available in English and Freanch.
http://www.unesco.org/oss/
ELABORATION OF AN INTERNATIONAL CONVENTION TO COMBAT DESERTIFICATION
1994 ENGLISH Original ENGLISH INTERGOVERNMENTAL NEGOTIATING COMMITTEE FOR THE ELABORATIONOF AN INTERNATIONAL CONVENTION TO COMBAT desertification IN THOSE
http://sedac.ciesin.org/pidb/texts/un.desertification.final.resolution.1994.html

Extractions: This data access service is provided by the Center for International Earth Science Information Network (CIESIN), which operates the Socioeconomic Data and Applications Center (SEDAC) for the U.S. National Aeronautics and Space Administration (NASA). See the ENTRI query system for information about the status of this treaty. See the ENTRI thematic guide for more information about the relationships between environmental treaties, national resource indicators, and remotely sensed data. ENTRI data providers make every effort to ensure the accuracy, reliability, and completeness of the texts and other information included in this collection; however, neither CIESIN nor the ENTRI data providers verify or guarantee the accuracy, reliability, or completeness of the contents of ENTRI. If you encounter an error, please notify us by e-mail to entri@ciesin.org.
Desertification: Monitoring & Forecasting
Text and video reports about remote monitoring in the arid southwest region of United States. General details about desertification, forcasting, desert plants and a photo gallery is also there.
http://www.evsc.virginia.edu/~desert/
CARRE At SDSU - Aral Sea Desertification Study
The Aral Sea Area desertification ChangeDetection Study. A tremendous amountof desertification can be seen between the years of 1973 and 1989.
http://www.geology.sdsu.edu/facilities/carre/carre_study.html

Extractions: at San Diego State University The following images show the drastic environmental changes that have occurred during the last few decades. As water from the Syr Darya and Amu Darya rivers has been diverted (primarily for irrigation of cultivated fields), the Aral Sea has been drying up, leaving large areas of evaporated pesticide-laden dust to blow over the local inhabitants. These images focus on the southern coast of the Aral Sea, as the shoreline recedes and former fishing ports are stranded far from the sea. A tremendous amount of desertification can be seen between the years of 1973 and 1989. These Landsat MSS processed subscenes of the southern Aral Sea area show the retreat of shoreline from the Muynak area, once a prosperous commercial fishing center. The Aral Sea is fed from the south by the Amu Dar'ya river, and from the east by the Syr Dar'ya river.
Bright Edges Of The World
Smithsonian Institution electronic exhibit about deserts and other arid and subhumid environments, emphasizing desertification and other degradation and its consequences.
http://www.nasm.si.edu/ceps/drylands/

Extractions: Welcome to an electronic exhibit about the world's drylands. Drylands include arid, semi-arid, and dry sub-humid areas all over the world. The aim of this exhibit is to show the importance these environments have in the lives of people everywhere, and the threats they face. Please choose a section of the exhibit below.

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