GreenFacts Publication, available at http://www.millenniumassessment.org/documents/document.355.aspx.pdf
Technology is not the solutions for everything. As I mentioned before, “No one is capable of saving others from death (not even with the most advanced technology).”
Below are added on 11 December 2009 (UCT+8 19:58)
ILLUSTRATIONS ON DESERTIFICATION
AGING OF OUR PLANET EARTH – A PROCESS THAT CANNOT BE REVERTED
"Viewed from the landscape patterns in the artificial oases, the number of the landscape patches is reduced by the compatible phenomenon, the size of the landscape patches is enlarged, and the variation and the diversity of the artificial oases are reduced. . . It is not enough to analyze the stability of an oasis only from its internal structure, an oasis should also be regarded as a whole to research its stability, namely to research the interaction of the oasis and its surrounding deserts. We used the cold-island effects (formula 3.1 in this article) of the oasis to measure this interaction."
(Fig. 2 in this article) Annual precipitation is around 100 mm and 400 mm per year (counting from 1961- 1996). Note (1)
"In this now widely accepted system, extremely arid lands have at least 12 consecutive months without rainfall, arid lands have less than 250 millimetres of annual rainfall, and semiarid lands have a mean annual precipitation of between 250 and 500 millimetres. Arid and extremely arid lands are deserts, and semiarid grasslands generally are referred to as steppes." Note (2)
Note (1) – Luo Geping, Chen Xi, Zhou Kefa and Ye Minquan, Temporal and spatial variation and stability of the oasis in the Sangong River Watershed, Xinjiang, China, 12 April 2002, available at http://www.scichina.com:8080/sciDe/fileup/PDF/03yd0062.pdf
Note (2) – USGS Publication Service Centre, What is a Desert? Available at http://pubs.usgs.gov/gip/deserts/what/, last modified on 18 Dec 2001.
From the above data, Oasis is being classified as an “isolated system (cold-island effects)” with the supplies of underground water (and it may contain certain amounts of salt). Desertification is the aging of this planet. To be more specific, it cannot be recovered. You can refer to the data of participations above.
An oasis is an independent system. Oasis needs the provisions of underground water. Its size does matter to the annual precipitation. Meanwhile, it is still below 500 millimetres in this case.
The Earth is our only resort. Green Movement is the trend.