10.2190/Q7R5-3CBW-J9LE-MGPD Q7R53CBWJ9LEMGPD 1 A Desirable Environmental Model 153 162 20020509 20020509 20020509 20020509 Q7R53CBWJ9LEMGPD.pdf http://baywood.metapress.com/link.asp?target=contribution&id=Q7R53CBWJ9LEMGPD 3 Richard H. Wills University of Prince Edward Island, Charlottetown, Prince Edward Island, Canada A long-term ecological model is presented for man's use of the environment. A definition of Desirable Environmental Use is formulated in terms of Actual Environmental Use and two limits on Actual Environmental Use. One limit, the Impact Share, is the amount of negative impact allowed on each species in the environment. The other limit, the Resource Share, is the amount of each non-living resource that may be acquired. Desirable Environmental Use is related directly to maximum desirable human population size and maximum desirable individual consumption.