] Traditionally assessments of U.S. energy consumption have
] been broken down into four categories: industry, which
] consumes about 35 percent of the total each year;
] transportation, 27 percent; residential, 21 percent; and
] commercial, 17 percent. Significantly energy consumption
] usually tracks pretty closely with carbon dioxide
] production because most of the energy consumed is in the
] form of fossil fuels, which release greenhouse gases