One is to restrict the carbon-dioxide emissions of the 11, 000 companies trading on it to an agreed cap.

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But the UN's Environment Programme reckons that even if all countries honour their existing commitments, global emissions in 2020 would exceed the likeliest total consistent with that pledge by the equivalent of up to 11 gigatonnes of carbon dioxide.

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Figures for 2010 show the island emitted 379.1kt of carbon dioxide equivalent, which was a decrease of 11.6% on the 2009 figures.

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The facility would spew out up to 11.5m tonnes of carbon dioxide a year as it feeds the power needs of the booming south-west, primarily around Phoenix and Las Vegas.

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If Walmart is able to replicate their efforts on a national level, an 80 percent reduction in waste would be the equivalent of preventing 11.8 million metric tons of carbon dioxide emissions each year.

FORBES: Written by Melissa Hincha-Ownby

For example, the adoption of genetically engineered, herbicide-tolerant crops just in the United States contributed in 2010 to the equivalent of removing 11 billion pounds (5 billion kg) of carbon dioxide from the atmosphere, the equivalent of removing nearly 2.25 million cars from the road for one year.

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The draft curriculum for geography does not contain references to climate change but a section called "Earth science" in the chemistry syllabus says 11- to 14-year-olds should be taught about "the production of carbon dioxide by human activity and the impact on climate" and includes a section on "the efficacy of recycling".

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