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Intensity of Use for Selected Materials US: 1900-2000 Kilograms/GDP (indexed to 1940) 100 Plastic 10 Aluminum Timber Lead Phosphate Rock Potash Paper & Board Steel Potash Phosphate Rock 1 Paper & Board Copper Lead Timber Steel Plastic 0.1 Aluminum 0.01 1900 1910 1920 1930 1940 1950 1960 1970 1980 1990 2000 Data Notes Notes: Consumption data are divided by GDP in constant 1996 dollars and indexed to their value for 1940. (For example, in 1900 the United States consumed 253,000 metric tons of lead and GDP was 311 billion dollars, giving a ratio of about .814 metric tons of lead per million dollars GDP; in 2000 1,740,000 metric tons of lead were consumed and GDP was 9224 billion dollars, giving a ratio of about 0.189 metric tons per million dollars GDP.) Data for US Gross Domestic Product 1900-1928 are in 1996 dollars and are taken from Balke, Nathan S., and Robert J. Gordon. 1989. "The Estimation of Prewar Gross National Product: Methodology and New Evidence." Journal of Political Economy 97 (February): 38-92. Data for US Gross Domestic Product 1929-2000 are in 1996 dollars and are taken from the Bureau of Economic Analysis National Income and Product Accounts Tables http://www.bea.doc.gov/bea/dn/gdplev.xls Data on US Minerals consumption 1900-2000 are taken from the U.S. Geological Survey Open-File Report 01-006 Historical Statistics for Mineral Commodities in the United States -http://minerals.usgs.gov/minerals/pubs/of01-006/ Data for Timber and Paper & Board 1900-1998 are taken from Industrial Wood Productivity in the United States, 1900-1998 Ince, Peter J. 2000 Res. Note FPL-RN-0272. Madison, WI: U.S. Department of Agriculture, Forest Service, Forest Products Laboratory Data for plastics for 1935-1991 were compiled by the U.S. Geological Survey Minerals Information Team, Reston, VA. Data for plastics for 1992-2000 were taken from Chemical & Engineering News, June 25, 2001, pp. 44-51.