In addition to each of the individual barrier areas, an additional complication arises due to the large degree of interaction among the areas shown in Figure 6. For example, if we assume that altering the biological composition of a particu- lar source crop would be beneficial, then this may have consequences on the process required, the type and performance of materials to be utilized, the infra- structure required to support this use, and the scientific education of students who may be subsequently employed within such a system. The dynamics are such that a change in one part of the "barrier topography" has a considerable ripple effect throughout the.
