Liquid Metal Fast Breeder Reactor Program: sec. 7. Mitigation of adverse environmental impacts. sec. 8. Unavoidable adverse environmental impacts. sec. 9. Short term benefits and long term losses. sec. 10. Irreversible and irretrievable commitments of resources. sec. 11. Cost-benefit analysis.- v. 5. Appendix. Comment letters 1-25 and responses.- v. 6. Appendix. Comment letters 26-38 and responses.- v. 7. Appendix. Comment letters 39-66 and responses