In T. Goldfarb, ed. Taking sides . In B.L. Turner et al., eds. Cambridge University Press, pp. Hocking, Martin B. 1991a.
Disposable cups have eco-merit.
Hogan, William. 1991. Hohenstein, W. G. and L. L. Wright. Holdren, John P. 1991. Energy in transition. In Energy for planet earth , readings from Scientific American.