(court upholds defendant's designation of 850,000 acres of land as critical habitat for 15 endangered or threatened species despite deficiencies in defendant's wetlands designations; vernal pools at issue deemed to be unique type of wetland ecosystem and all of the designated land was necessary to be set aside from development even though requirements for species' survival not present on entire tract; designation viewed by court as way to protect endangered species in the future; no consideration of impact of designation on home and land values or local economy).