There are grasslands, still largely unchanged by time or man. Conservationists and environmentalists all these time have been complaining of forest over-exploitation and its destruction by man. But, how are they prepared to make maximum use of the wood and hills where man did not trod yet? If not all, some are coming up with innovative and constructive ideas. Conservationists Curt Freese and Sean Gerrity working for a program for World Wildlife Fund believe prairie of north-central Montana, the grasslands largely unchanged by time or man, an ideal place for bison to roam again. Their vision is supposed to take a concrete shape today, as they will be releasing 16 buffalo from a holding pen onto a portion of the nearly 32,000 acres of land that has been purchased or leased as the start of a wildlife reserve. It will eventually grow to hundreds of thousands of acres, the conservationists hope.