NEPA requires the disclosure and analysis of the human impact on the natural environment. That natural environment is often habitat for endangered and threatened and bears the title of "critical habitat".
Habitat is a combination of environmental factors that provides food, water, cover and space that a living thing needs to survive and reproduce. Habitat types include: coastal and estuaries, rivers and streams, lakes and ponds, wetlands, riparian areas, deserts, grasslands and prairies, forests, coral reefs, marine, perennial snow and ice, and urban.