Which groundbreaking book, published in 1962, is often credited with inspiring the modern environmental movement and influencing the creators of Earth Day?
Before Gaylord Nelson's initiative, another prominent environmental activist, John McConnell, proposed an 'Earth Day' in 1969 to be celebrated on what specific annual date, tied to an astronomical event?
What was the global theme for Earth Day's 50th anniversary in 2020?
The first Earth Day in 1970 is often cited as the largest single-day protest in U.S. history by participation. What percentage of the U.S. population participated?
What is the name of the global organization that grew out of the first Earth Day and coordinates many international Earth Day events today?
What color is most commonly associated with Earth Day and environmental movements?
When Earth Day went global in 1990, what new environmental issue did it specifically highlight that was not as prominent in 1970?
Senator Gaylord Nelson's inspiration for an environmental teach-in came after witnessing the devastating impact of which specific event in 1969?
The widely recognized three-arrow triangular symbol represents what environmental action often promoted on Earth Day?
Beyond the EPA, the momentum from the first Earth Day in 1970 directly led to the passage of several landmark environmental laws in the U.S. Which of these was NOT passed in the immediate aftermath (1970-1972)?