The Nature Conservancy in the context of "Block Island"

The Nachusa Grasslands is a 3,800 acres (1,500 ha) restored tallgrass prairie near Franklin Grove in Lee County and Ogle County, Illinois. It is managed by The Nature Conservancy staff and volunteers.

Wildlife conservation refers to the practice of protecting wild species and their habitats in order to maintain healthy wildlife species or populations and to restore, protect or enhance natural ecosystems. Major threats to wildlife include habitat destruction, degradation, fragmentation, overexploitation, poaching, pollution, climate change, and the illegal wildlife trade. The IUCN estimates that 42,100 species of the ones assessed are at risk for extinction. Expanding to all existing species, a 2019 UN report on biodiversity put this estimate even higher at a million species. It is also being acknowledged that an increasing number of ecosystems on Earth containing endangered species are disappearing. To address these issues, there have been both national and international governmental efforts to preserve Earth's wildlife. Prominent conservation agreements include the 1973 Convention on International Trade in Endangered Species of Wild Fauna and Flora (CITES) and the 1992 Convention on Biological Diversity (CBD). There are also numerous nongovernmental organizations (NGO's) dedicated to conservation such as the Nature Conservancy, World Wildlife Fund, and Conservation International.

The Channel Islands (Spanish: islas del Canal, Archipiélago del Norte) are an eight-island archipelago located within the Southern California Bight in the Pacific Ocean, off the coast of California. They define the Santa Barbara Channel between the islands and the California mainland. The four Northern Channel Islands are part of the Transverse Ranges geologic province, and the four Southern Channel Islands are part of the Peninsular Ranges province. Five of the islands are within the Channel Islands National Park. The waters surrounding these islands make up Channel Islands National Marine Sanctuary. The Nature Conservancy was instrumental in establishing the Channel Islands National Marine Sanctuary.

There is evidence that humans have lived on the Northern Channel Islands for thousands of years. Analysis of radiocarbon dating data indicates a continuous human presence starting between 8,000 and 11,000 years ago. The islands were inhabited primarily by two different Native American groups, the Chumash and the Tongva (Gabrieleño). The Channel Islands and the surrounding waters house a diverse ecosystem with many endemic species and subspecies. The islands harbor 150 unique species of plants.

The Emiquon National Wildlife Refuge is a 11,122-acre (45.01 km) wetland wildlife refuge located in Waterford Township in Fulton County, Illinois across the Illinois River from the town of Havana. Only 3,000 acres (12 km) are currently managed by the U.S. Fish and Wildlife Service as part of the Illinois River National Wildlife and Fish Refuges Complex. It is in the Central forest-grasslands transition ecoregion.

Most of the wildlife refuge is made up of reclaimed agricultural land. A 7,100-acre (29 km) reclamation project within the Refuge, the Emiquon Project, is operated by The Nature Conservancy, which is a partner with the U.S. Fish and Wildlife Service in the creation of the Refuge.

The Holzwarth Historic District comprises a series of cabins built by the Holzwarth family as a guest ranch inholding within the boundaries of Rocky Mountain National Park, at Grand Lake, Colorado. The Holzwarths made their homestead in the Kawuneeche Valley in 1917, two years after the establishment of the park, and received a patent on the homestead in 1923. Guest ranch use began in 1919 and continued until the ranch was purchased by The Nature Conservancy in 1974. The property was transferred to the National Park Service in 1975 for incorporation into the park. The district comprises a number of rustic cabins on the Colorado River. Operations existed on both sides of the river, first known as the Holzwarth Trout Ranch and later as the Never Summer Ranch. All but Joe Fleshut's cabin have been removed from the east side of the river.

John Holzwarth Sr. was a saloonkeeper in Denver. In 1916 Colorado enacted prohibition, leading Holzwarth to try homesteading at Grand River. The opening of the Fall River Road over the mountains to Estes Park in 1920 created an opportunity for Holzwarth to take in guests. The operation was taken over by John Holzwarth Jr., who ran it until 1973 when The Nature Conservancy bought the property.