Abstract
Many atmospheric scientists involved in longterm climate forecasting believe that the documented increases in concentrations of atmospheric carbon dioxide (CO,) and other greenhouse gases will continue (Seidel and Keyes) and will bring about a general warming of the earth's surface (Manabe and Wetherald, Walts). Recent estimates of trends in atmospheric accumulation of the most important greenhouse gas, CO2, project a doubling in concentrations sometime between 2035 and 2075 (White) and a consequent 3 ± 1.5 degrees centigrade (C) mean global temperature increase (Herbert), with much larger increases in the higher latitudes. Predictions for such dramatic changes in climate raise concerns for the future viability of agricultural sectors already severely constrained by climate. Therefore, despite considerable uncertainty concerning the magnitude and timing of the greenhouse effect, agricultural impact studies are being under
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