Final answer:
Johnson's environmental policies triggered significant legislative measures that improved air and water quality, waste disposal, and wilderness preservation, laying groundwork for future conservation efforts.
Step-by-step explanation:
Johnson's policy on cleaning up the environment led to several significant legislative achievements aimed at environmental protection and public health. The Johnson administration was instrumental in enacting laws that improved air and water quality, regulated the disposal of solid waste, and preserved wild areas and wildlife. Notable examples include the Wilderness Preservation Act of 1964, which saved 9 million acres of land, and the Land and Water Conservation Act of 1965, which allocated funds for conservation projects across different government levels. Johnson's environmental actions set a precedent that influenced the later establishment of the federal agency dedicated to environmental issues under President Nixon, highlighting the long-lasting effects of his environmental policies.