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== Enllaços externs ==
* [http://pages.prodigy.net/jhonig/bignum/qland2.html Surface area of the Earth] {{Webarchive|url=https://web.archive.org/web/20041031145545/http://pages.prodigy.net/jhonig/bignum/qland2.html |date=2004-10-31 }}
* [http://technorati.com/business/finance/article/arable-land-shortage-and-the-case/ Article] {{Webarchive|url=https://web.archive.org/web/20120302133333/http://technorati.com/business/finance/article/arable-land-shortage-and-the-case/ |date=2012-03-02 }} from Technorati on Shrinking Arable Farmland in the world
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