Sources:
http://www.usitc.gov/publications/332/2012-08_ChinaCopper(HammerLin).pdf
http://www.betonabq.org/images/imguser/WorldReport_Aug_2013final__01__cement.pdf
http://www.usda.gov/oce/commodity/wasde/latest.pdf
http://www.statista.com/topics/1668/wheat/
http://www.eia.gov/cfapps/ipdbproject/IEDIndex3.cfm?tid=3&pid=26&aid=2
http://www.ncga.com/upload/files/documents/pdf/woc-2014.pdf
http://www.indexmundi.com/agriculture/?commodity=wheat&graph=domestic-consumption
http://www.statista.com/statistics/255971/top-countries-based-on-rice-consumption-2012-2013/
http://www.statista.com/statistics/255977/total-global-rice-consumption/
http://www.ncga.com/upload/files/documents/pdf/woc-2014.pdf
http://www.european-aluminium.eu/consumption-primary-aluminium-consumption-in-world-regions/
http://www.insg.org/prodnickel.aspx
http://www.eia.gov/cfapps/ipdbproject/IEDIndex3.cfm?tid=1&pid=1&aid=2
http://www.eia.gov/cfapps/ipdbproject/IEDIndex3.cfm?tid=1&pid=1&aid=2
https://www.cdp.net/en-US/Programmes/Pages/forests-palm.aspx