Geophysical and geochemical aspects of environmental degradation (B. Bolin). Ecosystem dynamics (S. Levin, S. Pacala). Property rights, public goods, and the environment (D. Starrett). Economics of common property management regimes (J.-M. Baland, J.-P. Platteau). Population, poverty, and the natural environment (P. Dasgupta). The Theory of pollution policy (G. Helfand, P. Berck, T. Maull). Mechanism design and the environment (E. Maskin, S. Baliga). The Political economy of environmental policy (W. Oates, P. Portney). Experience with market-based environmental policy instruments (R. Stavins). Experimental evaluations of policy instruments (P. Bohm). Technological change and the environment (A. Jaffe, R. Newell, R. Stavins).