Abstract
That atmospheric CO 2 concentration is increasing is well established, and it is generally well accepted that this increase will have beneficial effects on plant productivity. What remains most uncertain is the nature and magnitude of the climatic changes that will occur as a result of the increase of carbon dioxide and other radiatively active trace gases. Thus, it is difficult to predict the combined impact of increasing atmospheric carbon dioxide on agricultural productivity. A comprehensive cropping system simulation model, EPIC, was used in a sensitivity analysis of crop growth response to the combined effects of CO 2 concentration increase and CO 2-induced climate change. Maize, soybean and wheat cropping systems in the midwestern USA were studied.
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