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<br />002911. <br /> <br />~1~~ <br /> <br />The full employment assumption applies only to the National <br />level where a 4 percent unemployment rate is assumed. This <br />leaves room for regional variations in unemployment rates. <br />The regional projection methods recognize anditake into account <br />the regional differences in employment/population ratios. <br /> <br />-.: :~;- <br />"_ U,," <br /> <br />~~J;:: <br /> <br /> <br /> <br />,-,:;.:;::.,~ ".- <br />~&:":;;'-- <br />gf!~f <br />fuf.~:{_0 <br /> <br /> <br /> <br /> <br /> <br /> <br /> <br />.~t.=f':~< <br />~~~~ <br />~:*~~i"1 <br /> <br /> <br />I <br /> <br />E. Availabilityof Energy Sources, Raw Materials and Space <br />for Projected Growth <br />fire these resources adequate to accommodate the projection.s? <br />The nine fold increase in gross product or personal income. <br />will inevitably draw heavIly upon energy and upon raw materials. <br />It is true that so.me stored energy stocks (fossil fuels) are being <br />depleted. But at the same time fossil fuels which were formerly <br />inaccessible are coming within reach -- for example, oil from <br />shale in Colorado. Moreover, there are as yet unrealized <br />potentials in fusion power as well as in use of direct sunlight. <br /> <br />It is even less clear how there can be any ultimate shortage <br />of materials. Virtually no material is without subs titutes for all <br />its uses. Moreover, technology continues to widen the range of <br />possible uses and consequently the range of possible substitutes. <br />There are still substantial possibilities for economizing on <br />materials use through recycling. <br /> <br />Concern about the future availability of energy and materials <br />is usually covered in an implicit assumption of a continuation of <br />existing trends in technological development. We do visuali",e <br />a vast changes in energy and material use, but we do not see <br />these as constraints on income levels. <br /> <br />It is true that short of inter-planetary colonization, "natural <br />living space" is limited. A doubling of the population is likely to <br />exert pressure on this living spac.e potential. But we do not view <br />it as a constraint on population growth. Living space is a human <br />artifict which is created and appropriate infra structure and <br />environmental safeguards can be built in. <br /> <br />F. Environmental Consideration <br />The question was raised several times as to what constraints <br />were assumed to accommodate public concern about envi.ronmenta.l <br />quality. <br /> <br />7 <br /> <br />~~}; <br />Y;~Jii~i~ <br />~~;{{: <br /> <br />::'-co-. <br />.:..:---.., <br /> <br /><:..~.: ~ - - <br /> <br />.. <br /> <br /> <br />[~~'t.ll~~~Ir.&yjif:$~il <br /> <br />