8Soytas U, R. Sari, and B. T. Ewing. Energy consumption, income, and carbon emissions in the United States [ J ]. Ecological Economics, 2007,62 ( 3 - 4 ) :482 - 489.
9Dalton M, O. Neill B, Prskawetz A, Jiang, Pitkin J. Population aging and future carbon emissions in the United States [ J ]. Energy Economics, 2008,30 (2) :642 - 675.