soereiies in chaos or sysrems in disorder Today superhighways and over-panes in Masaaehuseiis alone need some «)0 billion dollar. io repair, and ihe eullaprrng rewer sysierns oi London and New York some in unions. Neiiner Masazhmr London, nor New liorlr can raise rhis money, which shows ihai an unlhinki‘lls hasrorreai developmeni smegy ran cripple o iuiure soereiy Today-s luxuries are knmurmw‘s disasiers. Wm Any syslunl or organism can Imam onlyihaiouamny ullmmmlchunmumwuammAny moored iriool beyond lhai poinuhmws ihe sysiom oi orpsrruhinlodisordnrimwolynlzmsmioeha ioim oi chronic polIIAKIm Bolll in over- and undersuppiy oi resoureos have much ihe same em eroepi ihai oversupply has more groiesoue results in liie symlls mm undersuppiy. To . degiee, undersuppiy an be eoped wrih by Minced growih and a wider spasirrg or dispersal olorgamm, huloyersuppiyoia resauree ean cause iniiaied growth, crowding, snd sociopaihy in serial organisms. in people, boih gross uyere and under-nurriiior. are common» :ihreal resoune managerneni is needed io oalairse our ihe paihologies oi ianrlne and obesriy. 1.5 YIELDS Yreids an be ihooghr oi in irnrnediare, palpable, and mnieriai ways, and arei iy wily measured as l. PRODUCT YIELD: The sum oi priinary and derived produeii available iron, or surplus ro, iire sysiein Some oi ihese are inu'iluir ior preeede duly), oihers are eieaied by design. 2 ENEch YIELD' The suirr oi eonserved, siored. and generaied energy surplus io ihe aysoerri again ham uriiinsie and ihose ereaied by design. Impalpmble yields are rhose reiaied io healrh and nubirion, seorriry, and a sarisimory sodal ooniein and iriesiyie Niri surprisingly, ii is ihe ieareh ior iheae invisible yields ihar ml oiien dnyes people in seek good design or io ialre up hie on ihe land, ior “le does ii oenefii a man r: he gains ihe whole world and Inns his souii- Thus, we see ihe invrsibie yields in ierans nlvlln: and (Huge This goyenrs our eoneepi oi needs and seis ihe iuniis oi "almigh‘, Here, we see an eihroiibasrs ara viul eomponenioiyieiol. Al||wu5h all sysiems have a naiurai or base yield depending on iheir produeirvriy, our eonsern in perm-whine is ihai ihis esseniiai bare yield is susrrirrabie. Sever-i iaeuirs now openie lo reduoe ihe yield oi natural sysiems. lu ihe simplesi iorm, ihis rs ihe overuse oi energy in degeneraiiye iyaiems due ro ihe uanse aypflulion oi iossii iuel energy, "Pmmnlng by unproduerave nae" rs observable and Widespread 15 Thus we musr eoneenrrsie on produeirye use, whieh implies ihai ihe energy used is ruined inro biologxal growiir and held as basis iryrng maienai in the global eeosysrem Unused, wasred, or irivoiousiy used resources are energies running wild, which ereaies ehaos, desieoya basir resourees, end eyeniuaiiy sooirsius ail yield or surplus in design m5, we on. rind yields iroor ihese living popularrons or resourpes whirh are ihe sioeio oi ihe biologisi iihe so-ralled sian ' g errrpl or lrorn none ying aysiems sueh as ihe eiimaiie eiemenis, chemical energy, and mlchine ieehnoiogy. There is energy siored by exiinei liie as seal, on, and gas; energy ieii over irom ihe ionnauori oi ihe eanh as geoiiierrnai energy; iidesi and eleeirornagnerie nnd grayiiaironai lmca,CoIiIllculd solar energies impinge on ihe esnh, 2nd liie inoereepis ehese iiowa in male rheur available ior liie iorun. in our small pan oi ihe sysiem (ihe design siiei our wark is io m, dim, eonserye, and sonven io useiui ior-rrrs ihose energies ihaieaui on, or pass ihrough, ihe siie The ioiai suan at our siraiegy, in rerurs oi surplus energy useiully siored, is ihe sysierrr yreii oi drsigri Syslom yield is m rum Mal oi surplus energy plodooed by, siorori. conserved. mused. ul rammed by me design. snowy is in surplus onoo ihe sysism lisen his lv-Ilabll all is noodsiorgrosnh. Wufllorl, 1M marnienanoo Some biologisis may deiine yreid or produslion in more narrow ierrns, aeeepimg ihai a ioresi, lake, or crop has a irnrie upper lirnii oi surplus due to suosrraie eondillens and ryiiiable energy We do nor hnye io Acre-pt ihis, as ii is a passive approrrh. inapplieable ro zckiv: and eonseious design or icliv: managemeni using, ior example, ieniliaers, windbreaks, or seieeied spedess Even more narrowly deirned is ihe yield oi agrieuiiurai eeononusrs, who regard a single produei ipeaehes/irai as ihe yield ll may be Ihisapvpmuh ioeli iiseii whreh is she one iimii iii yre A true aeeouniing oi yield lakes inin eonsideraiion boih upsrream eusis ienerpyi and downsireaur eesis (hullhl The 'prmduu yield" IIuy ereaie problems oi poiiuirein and soil mineral loss, and eosi more thn ii esn repiase The very eonrepi oi surplus yield supposes eiiher ilriw ehrough or groweh wiihin one syimn Coal and rock do rroi have yield in ehis sense; ihey have a hnire or limried produei On|y lite and How ean yield ponirnuaiiy, or as long as ihey persrsr 'flius no energy sioels oi any aysiem are ihe ilows and lives wiihrn )L The ilow may exisi wiflmui iiie ins on ihe moon), where only ieehnoiogy oar. irriervene lo omain a yield, but on esnh ar ieasr, irle is ihe mkrvcnin‘ siraiegy ior eapiuring ilow and pmudng yield And reehneriogy depends on ihe eoniinuaiiorr oi hie, noi ihe opposire