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In 1962, Rachel Carson published Silent Spring, calling attention to the deleterious effects of pesticides like DDT on birds. Eight years later, in 1970, the first Earth Day was held and the US Environmental Protection Agency (EPA) was created. For many, that historical moment marked the beginning of the modern environmental movement in the United States, a paradigmatic shift from aconservationist mindset of preserving the land as it was, to one in which the damage done to the Earth by humans (often in the service of economic growth) could no longer be ignored. The urge to advocate for healing the planet, to quantify and record the destruction, and to use technology to repair what had been broken developed along with this growing ecological awareness. Here, we trace the story of this transition through the unique material culture of the modern environmental movement: instruments to measure pollution, buttons to evangelize environmentalism, and tools to create cleaner forms of energy.