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During those three decades, drylands expanded worldwide by 4.3 million sq. km (1.66 million sq. mi.), an area nearly a third larger than the nation of India. And when the UNCCD says dry, they mean ...
Drylands cover 41.3% of the Earth's land surface, including 15% of Latin America, 66% of Africa, 40% of Asia, and 24% of Europe. There is a significantly greater proportion of drylands in developing countries (72%), and the proportion increases with aridity : almost 100% of all hyper-arid lands are in the developing world.
The Nama Karoo in South Africa is a xeric shrubland that receives between 100 and 500 millimetres (4 and 20 in) of rain a year. [3]The conversion of productive drylands to desert conditions, known as desertification, can occur from a variety of causes.
[41] [7] It has been estimated that some 10–20% of drylands are already degraded, the total area affected by desertification being between 6 and 12 million square kilometers, that about 1–6% of the inhabitants of drylands live in desertified areas, and that a billion people are under threat from further desertification. [42] [43]
The Global Dryland Alliance (GDA) is an international organization composed of dryland countries and is headquartered in Doha, Qatar. [1] Officially formed in October 2017 with a membership of 11 countries, the organization has the stated aim of advancing food security for dryland nations and innovating technologies in the fields of agriculture and water security.
Dryland farming caused a large dust storm in parts of Eastern Washington on October 4, 2009. Courtesy: NASA/GSFC, MODIS Rapid Response [1]. Dryland farming has evolved as a set of techniques and management practices to adapt to limited availability of water, as in the Western US and other regions affected by climate change for crops such as tomato and maize.
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McMurdo Dry Valleys, Landsat 7 imagery acquired on December 18, 1999 The Dry Valleys are so named because of their extremely low humidity and lack of snow or ice cover. They are also dry because, in this location, the mountains are sufficiently high that they block seaward-flowing ice from the East Antarctic Ice Sheet from reaching the Ross
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