Front Matter -- Preface -- Contents -- Summary -- 1 Perspective on Environmental Health -- 2 Rebuilding the Unity of Health and the Environment -- 3 Environmental Health: A Fifty-Year Perspective -- 4 Human Health and the Natural Environment -- 5 Human Health and the Built Environment -- 6 Human Health and the Social Environment -- References -- Appendix A Agenda -- Appendix B Speakers and Panelists -- Appendix C Meeting Participants.