Roberts, J. Timmons, Peter E. Grimes, and Jodie L. Manale. “Social Roots of Global Environmental Change: A World-Systems Analysis of Carbon Dioxide Emissions”. Journal of World-Systems Research 9, no. 2 (August 26, 2003): 277-315. Accessed August 4, 2020. http://jwsr.pitt.edu/ojs/jwsr/article/view/238.