"I would like to summarize the findings of our research in climate modeling and place our results in the context of the existing body of knowledge of the CO2 greenhouse effect. Although the increase of atmospheric CO2 is well documented it has not yet resulted in a measurable change in the earth's climate. The concerns surrounding the possible effects of increased CO, have been based on the predictions of models which simulate the earth's climate. These models vary widely in the level of detail in which climate processes are treated and in the approximations used to describe the complexities of these processes. Consequently the quantitative predictions derived from the various models show considerable variation. However, over the past several years a clear scientific consensus has emerged regarding the expected climatic effects of increased atmospheric CO2. The consensus is that a doubling of atmospheric CO, from its pre-industrial revolution value would result in average global temperature rise of (3.0 +/- 1.5) degrees Centigrade. The uncertainty in this figure is a result of the inability of even the most elaborate models to simulate climate in a totally realistic manner. The temperature rise is predicted to be distributed non-uniformly over the earth, with above-average temperature elevations in the polar regions and relatively small increases near the equator. There is unanimous agreement in the scientific community that a temperature increase of this magnitude would bring about significant changes in the earth's climate, including rainfall distribution and alterations in the biosphere. The time required for doubling of atmospheric CO, depends on future world consumption of fossil fuels. current projections indicate that doubling will occur sometime in the latter half of the 21st century. The models predict that CO2-induced climate changes should be observable well before doubling. It is generally believed that the first unambiguous CO2-induced temperature increase will not be observable until around the year 2000.... In summary, the results of our research are in accord with the scientific consensus on the effect of increased atmospheric CO2 on climate.... Furthermore our ethical responsibility is to permit the publication of our research in the scientific literature. Indeed, to do otherwise would be a breach of Exxon's public position and ethical credo on honesty and integrity."