1. For a general discussion of the climatic implications of the atmospheric build-up of carbon dioxide, seeInadvertent Climate Modification: Report of the Study of Man's Impact on Climate (SMIC)(Cambridge, Mass.: MIT Press, 1971). More recently evidence has been presented that the present global cooling trend may be one phase of a long-term climatic cycle which can be expected to end soon. Wallace S. Broecker has argued that we may be on the verge of a pronounced global warming from the increased carbon dioxide in the atmosphere. SeeScience(Aug. 8, 1975), p. 460.
2. Agricultural Productivity