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The Environmental history of the United States covers the history of the environment over the centuries to the late 20th century, plus the political and expert debates on conservation and environmental issues. The term "conservation" appeared in 1908 and was gradually replaced by "environmentalism" in the 1970s as the focus shifted from managing and protecting natural resources to a broader concern for the environment as a whole and the negative impact of poor air or water on humans. The late twentieth century saw a shift towards “environmental justice,” highlighting the way in which environmental benefits and burdens are unevenly distributed across lines of race, class, and ethnicity.
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Search interest data over the past 12 months indicates that this topic periodically attracts global attention. Sudden spikes often correlate with major news events, public statements, or geopolitical developments.