Over the next 30 years, most of Harris County's remaining open space will succumb to subdivisions, office buildings and shopping centers where millions of new residents will live and work, projections by local planners show. The spread of development, particularly west and northwest of Houston, is among the more striking trends shown in preliminary population and job growth projections developed by the Houston-Gal- veston Area Council for the eight-county Houston region. The potential loss of open space alarms conservationists and others concerned about suburban sprawl. It is among the factors driving an effort by business and civic leaders to find...