...the twentieth century. Why? Because new lands are marginal and environmentally sensitive and may not make up for the land being removed from cultivation each year because of urbanization and environmental degradation. New irrigation projects are increasingly expensive and subject to much stricter...

...and more irrigation, because land and water are becoming increasingly scarce (Feder and Keck 1994). Most new lands brought under cultivation are marginal...to be reallocated for municipal and industrial use. The challenge is worldwide, and both technological and political in nature. The technological aspect...

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...irrigation, because land and water are becoming increasingly scarce (Mitchell, Ingco, and Duncan). Many new lands brought under cultivation are marginal and...to be reallocated for municipal and industrial use. Thus expansion of irrigation or increased intensification through irrigation are not viewed as major...

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...becoming increasingly scarce (Crosson and Anderson, 1992; Mitchell et al., 1997; McCalla, 1998). Many new lands brought under cultivation are marginal and...ecologically fragile and cannot make up for the land removed from cultivation each year because of urbanization and land degradation. Sources of water that...

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