International environment : options for strengthening environmental agreements : statement for the record by Richard L. Hembra, Director, Environmental Protection Issues, Resources, Community, and Economic Development Division, before the Subcommittee on Arms Control, International Security, and Science, Subcommittee on Human Rights and International Organizations, Committee on Foreign Affairs, Subcommittee on Oceanography, Great Lakes, and Outer Continental Shelf, Committee on Merchant Marine and Fisheries, House of Representatives / United States General Accounting Office.