This document addresses the need for a two-pronged approach to the problem, considering the possibilities of both utilization of the off-gases to recover their energy content, and control of the pollutants in the off-gases. Combinations of control and utilization options may be required to optimize the maximum use of available energy while at the same time reducing emissions to minimize environmental impact. The options available will depend to a great extent on the nature of the off-gases which in turn is determined by such variables as the resource characteristics and the process/retort parameters. Some correlations of off-gas quality with these variables will be necessary for a detailed analysis.