Global climate change : hearing before the Subcommittee on Oceanography and the Great Lakes of the Committee on Merchant Marine and Fisheries, House of Representatives, One Hundred First Congress, first session, on H.R. 980, a bill to provide for development of a national global change research plan; to establish the Council on Global Environmental Policy; and to amend the National Environmental Policy Act of 1969, May 4, 1989. (U.S. G.P.O., 1989)