Global Extent of Land Degradation and Its Human Dimension - Principles of Sustainable Soil Management in Agroecosystems - page 226

Tiffen M., M. Mortimore, and F. Gichuki. 1994. More People, Less Erosion: Environmental
Recovery in Kenya. London: Wiley and Sons.
Tittonel P. 2008. Msimu wa Kupanda: targeting resources within diverse, heterogenous and
dynamic farming systems of East Africa.
Tittonell P., M. Corbeels, M. van Wijk, B. Vanlauwe, and K. Giller. 2008. Combining
organic and mineral fertilizers for integrated soil fertility management in smallholder
farming systems of Kenya: explorations using the crop-soil model FIELD. Agron J
100(5):1511-1526.
Tucker C.J., J.E. Pinzon, and M.E. Brown. 2004. Global Inventory Modeling and Mapping
Studies . College Park, MD: University of Maryland.
UNCCD (United Nations Convention to Combat Desertification). 2011. Land and Soil in the
Context of a Green Economy for Sustainable Development, Food Security and Poverty
Eradication . The Submission of the UNCCD Secretariat to the Preparatory Process
for the Rio+ 20 Conference. Online at http://www.unccd.int/knowledge/menu.php
(Accessed July 7, 2012).
UNCCD. 2012. Zero Net Land Degradation. A Sustainable Development Goal for Rio+20 .
http://www.unccd.int/Lists/SiteDocumentLibrary/Publications/UNCCD_
PolicyBrief_ZeroNetLandDegradation.pdf (Accessed July 7, 2012).
Vanlauwe B. and K.E. Giller. 2006. Popular myths around soil fertility management in sub-
Saharan Africa. Agr Ecosyst Environ 116:34-46.
Van Reuler H. and W.H. Prins 1993. The role of plant nutrients for sustainable food produc-
tion in sub-Saharan Africa. The Dutch Association of Fertiliser Producers, Netherlands,
p. 232.
Vitousek P.M. 1994. Beyond global warming: ecology and global change. Ecology
75:1861-1876.
Vlek P.L., Q.B. Le, and L. Tamene. 2010. Assessment of land degradation, its possible causes,
and threat to food security in Sub-Saharan Africa. In Food Security and Soil Quality ,
eds. Lal R. and B.A. Stewart, 57-86. Boca Raton, FL: CRC Press.
WCED (World Commission on Environment Development). 1987. Our Common Future , 124 pp.
Oxford, UK: Oxford University Press.
World Bank. 2008. Poverty and the Environment. Understanding Linkages at the Household
Level . Washington, DC: World Bank.
World Bank. 2011. Country data on agriculture. http://data.worldbank.org/indicator/
NV.AGR.TOTL.ZS (Accessed July 7, 2012).
World Bank. 2012. Inclusive Green Growth. The Pathway to Sustainable Development ,
Washington, DC: World Bank.
World Bank Development Indicators. 2011. Online data, http://data.worldbank.org/indicator/
(Accessed July 7, 2012).