1. 1. How has Earth Day changed in scope from the first celebration in 1970?
    While the first Earth Day was a national event in the United States, it became a global movement by 1990, involving 200 million people in more than 140 countries, reflecting the growing worldwide environmental consciousness.
  2. 2. What piece of U.S. legislation was directly influenced by the activism and public support of the first Earth Day?
    The activism surrounding the first Earth Day contributed to the political momentum that led to the passage of landmark environmental laws in the 1970s, including the Clean Air Act and the Endangered Species Act.
  3. 3. What important global environmental agreement symbolically opened for signatures on Earth Day?
    The Paris Climate Agreement, an international accord addressing climate change, was symbolically opened for signatures on Earth Day, connecting the event to high-level action and policy.
  4. 4. How has Earth Day contributed to environmental education in schools?
    Earth Day facilitated teach-ins and special programming, bringing environmental conservation into curricula and inspiring student involvement.
  5. 5. Why was the first Earth Day in 1970 historically significant?
    The first Earth Day mobilized 20 million people, making it the largest single-day protest in U.S. history, and boosted support for environmental legislation.
  6. 6. Why is sustainability considered a fundamental goal of Earth Day and its related movements?
    Ecological sustainability is the principle of managing natural resources and human systems for the benefit of both current and future generations. This principle underpins all Earth Day initiatives.
  7. 7. Which of the following are major human-driven causes of modern species endangerment?
    Major causes of species endangerment include habitat fragmentation, climate change, overhunting, and pollution—all primarily caused by human activity.
  8. 8. The Endangered Species Act provides protection for which of the following?
    The Endangered Species Act, passed in 1973, obligates federal and state governments to protect all species and their critical habitats that are threatened with extinction.
  9. 9. The Endangered Species Act is credited with the protection and recovery of which of the following animals?
    American alligators were removed from the endangered species list in 1987, bald eagles were removed in 2007, and gray wolves were removed in 2021.
  10. 10. Between 1970 and 2022, the Clean Air Act is credited with significantly reducing air pollutants by what percentage?
    The Clean Air Act established National Ambient Air Quality Standards that identified six major air pollutants all states, cities, and towns must regulate: sulfur dioxide, nitrogen dioxide, particulate matter, carbon monoxide, ground-level ozone, and lead.

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