Issues. They are the conflagrations, the bonfires, the burning controversies so profound, so personal they move people to take action and generate the momentum to change the political system and the course of history. Be it the Boston Tea Party of 1773, Jacob Coxey's Army, the Bonus Army March of June 1932, the National Moratorium to End the War in Vietnam, the Women's March of January 2018, or March for Our Lives to end gun violence in America in March of 2018, all came about because of Americans motivated by issues so much so they took their message of change to the street. Driven by issues which galvanized public opinion, people protested, demonstrating public solidarity for a cause. Earth Day: America at the Environmental Crossroads is a political history focusing on the issues which generated the first Earth Day in April 1970. It is about the people who brought about this momentous political turning point during a period in American history of unprecedented turmoil and political protest. Open its cover, and you will learn about the agents of change. Some have risen to take their place in the pantheon of environmental history; others are all but forgotten in the collective public mind. It begins with herbicide contamination and the Cranberry Scare of November 1959 then explains the use of Agent Orange in Vietnam and its impact on the environmental movement. Though the use of two nuclear weapons by the United States military ended World War II in the Pacific, the inevitable arms race with the Soviet Union during the Cold War led to the testing of these weapons of mass destruction. The second chapter explains how nuclear contaminated fallout became a health threat and a concern for environmentalists and the general public. Overpopulation seems to be a nonissue today. During the decades prior to Earth Day in 1970, the world's population numbers were a concern of monumental importance. This is the focus of chapter three. No credible treatment of the twentieth century environmental movement would be complete without addressing the contribution of Rachel Carson and her book Silent Spring. Unlike pesticides, the effects of which oftentimes surface years after exposure, deteriorating air quality burned the eyes and made it difficult to breathe. Polluted air particularly in the country's urban areas not only left an indelible impression in the minds of environmentalists, but it also threatened public health. And clean water, taken for granted today by most Americans, is the subject of chapter six, which describes the extent to which the country's waterways were part of a multibillion-dollar restoration project on the part of the states mandated by the federal government. The seventh chapter is a retelling of the oil spill disaster in Santa Barbara, California, and the radical fringe of the environmental movement which manifested itself before Earth Day, a fitting precursor to the event itself the subject of the final chapter.