In today’s world everyone is increasingly aware of the impact on future generations. Primarily, this issue confronts us in our efforts to come to grips with our national budget, and indebtedness it is creating for future generations. Of course, there is nothing intrinsically wrong with financing investments and payments over a period of time. But we do need to find the balance in the allocation of resources between the present and the future. This is the challenge that is facing the U. S. Department of Energy in facility clean-up, management and development of energy resources. In clean-up activities, for example, there are varying levels of clean-up, each with a different price tag, and each extending into the future. Which one is appropriate?