World Happiness Report by JeffDSachs & Co at @Columbia University's @earthinstitute http://www.earth.columbia.edu/sitefiles/file/Sachs%20Writing/2012/World%20Happiness%20Report.pdf …
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World Happiness Report by JeffDSachs & Co at @Columbia University's @earthinstitute http://www.earth.columbia.edu/sitefiles/file/Sachs%20Writing/2012/World%20Happiness%20Report.pdf …