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Executive Summary - Footnotes 1. See “Units for Measuring Greenhouse Gases” on page 3, and Intergovernmental Panel on Climate Change, Climate Change 1995: The Science of Climate Change (Cambridge, UK: Cambridge University Press, 1996). 2.
3. The sectoral shares of electricity-related carbon dioxide emissions are based on the shares of total electric utility power sales purchased in each sector. 4. Population-weighted heating degree-days in 1999 were 7.4 percent lower than in 1998. See U.S. Energy Information Administration, Annual Energy Review 1999, DOE/EIA-0384(99) (Washington, DC, July 2000), Table 1.9. 5 All industrial and manufacturing growth rates are taken from U.S. Federal Reserve Board, “G17 Historical Data: Industrial Production and Capacity Utilization.” Although the Federal Reserve Board, in calculating indexes, bases its estimates on two main types of source data, output measured in physical units and data on inputs to the production process, it also adjusts its indexes on the basis of technological improvements in factor productivity and outputs. This could be particularly important for indexes related to computers and semiconductors, for which productivity and quality of outputs have improved dramatically over time. 6 This year marks the first time that comprehensive estimates of methane emissions from petroleum systems appear in Emissions of Greenhouse Gases in the United States. Estimates of methane emissions from oil exploration and production, included in this report under the heading “Petroleum Systems,” are derived from U.S. Environmental Protection Agency, Office of Air and Radiation, Draft Estimates of Methane Emissions from the U.S. Oil Industry (Draft Report, Washington, DC). 7 Energy Information Administration, U.S. Coal Supply and Demand: 1999 Review, web site www.eia.doe.gov/fuelcoal.html. If you would like to receive any information relating to any of our greenhouse gas reports via e-mail, click here and subscribe by entering your e-mail address.
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