by these processes. The SPS requirements for other materials (e.g., aluminum, concrete) are a small portion of U.S. total annual production, but their impacts can still be large due to the large absolute quantities of materials involved. An attempt has been made to translate SPS materials requirements into actual pollutant loadings, as shown in Fig. 2.3. (Note that SPS system totals, based on an earlier SPS design configuration, are again being compared to U.S. annual totals.) The air pollution, water use, solid waste generation, and land use requirements represent measurable increments of a one-year U.S. total, indicating that the effects of SPS deployment will not be negligible. THE MATERIAL REQUIREMENTS CAN BE TRANSLATED INTO ENVIRONMENTAL LOADINGS Fig. 2.3. SPS Environmental Impacts
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