It is the purpose of this act to clarify and broaden the existing methods by which the Commonwealth and its local government units may preserve land in or acquire land for open space uses. The Legislature finds that it is important to preserve open space and to meet needs for recreation, amenity, and conservation of natural resources, including farm land, forests, and a pure and adequate water supply. The acquisition and resale of property interests authorized by this act are hereby declared to be for the public benefit, for the advancement of the public health, safety, morals and general welfare of the citizens of the Commonwealth, and for the promotion of sound land development by preserving suitable open space and concentrating more dense development in nearby areas.