Compare
(a) Shai Oster, The Water (Profit) Margin. China Real Time Report, Apr. 25,
2010.
http://blogs.wsj.com/chinarealtime/2010/04/25/the-water-profit-margin/
("Instead of spending as much as an estimated 500 billion yuan, about $73
billion, on the South-to-North Water Transfer Project * * * McKinsey says
China should invest in things like patching up leaky municipal water pipes,
managing irrigation better and recycling more industrial-use water.")
(b) Barbara Demick, China debates whether human activity or nature is to
blame for drought. Los Angeles Times, Apr. 26, 2010.
http://www.latimes.com/news/science/environment/la-fg-china-drought-20100426,0,2423807.story
("Some scientists say the fault lies with the destruction of the natural
forest and the replanting of cash crops that suck up too much water. Among
the notorious water-guzzlers are rubber trees and eucalypts, which are used
for paper and pulp production and are so vigorous that farmers sometimes
claim to hear them growing at night")
My comment: There is no need to read this LA Times report.
Note: 奥肯定律/奥肯法则 Okun's Law
http://en.wikipedia.org/wiki/Okun%27s_law
("The name refers to economist Arthur Okun [1928-1980; American] who proposed the relationship in 1962")