[en] A summary of the entire Environmental Statement and background information on the U. S. energy economy, the LMFBR Program and the relationship between the two are presented. The past, current and projected uses of energy and its importance to society, and the role of electricity, including that produced by nuclear reactors, in helping to meet the Nation's energy requirements are discussed. The origins and history of the LMFBR Program and a brief discussion of the several experimental and special purpose fast reactors that have been built in the United States since the late 1940's are included. The fast reactor programs in other industrialized nations are reviewed. A discussion of the current U. S. LMFBR program is offered which highlights the important program planning mechanisms, the key reactor plants now under design and construction, and the various supporting studies on LMFBR costs, technology, environmental impacts, and program planning. (U.S.)