This paper, an adaption from the author's forthcoming book "The Twenty-Ninth Day: Accomodating Human Needs and Numbers to the Earth's Resources," deals with non-military threats to national security. Since World War II the concept of national security has acquired an overwhelmingly military character. The policy of continual preparedness has led to the militarization of the world economy, with military expenditures now accounting for six percent of the global product. Most countries spend more on national security than they do on educating their youth. The overwhelmingly military approach to national security is based on the assumption that the principal threat to security comes from other nations. But the threats to security may now arise less from the relationship of nation to nation and more from the relationship of man to nature. Dwindling reserves of oil and the deterioration of the earth's biological systems now threaten the security of nations everywhere. (Author/RM)