During the 1960s and 1970s, continued growth along both coasts of the state and along Interstate 4 increased the strain on the ecosystems of the state. Portions of Big Cypress Swamp were drained for development, until the creation of Big Cypress National Preserve in 1974.[20] Additional acreage was added to Everglades National Park in 1989.[21] In 2000, Congress passed a federal effort to restore the Everglades, named the Comprehensive Everglades Restoration Plan (CERP), with the objectives of "restoration, preservation and protection of the south Florida ecosystem while providing for other water-related needs of the region."[22] and claiming to be the largest environmental restoration in history. The plan involves cooperation between the federal government, state, and local governments, and encompasses 18,000 square miles (47,000 km2) in 16 counties.[23] It is estimated that completion of the program will take 30 years, at an approximate cost of $7.8 Billion.[23]