Transitioning gracefully from the Age of Excess to the Era of Modesty. The 20th century saw unprecedented growth in population, energy consumption and food production. As the population shifted from rural to urban, human impacts on the environment increased dramatically. The 21st century ushered in an era of declines, including:
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20th Century Biological Sciences Conservation Ecology Economic Conditions Economics Education Education & Reference Environment Environmental Policy Environmentalism History Human Geography Modern (16th-21st Centuries) Natural Resources Nature Nature & Ecology Political Economy Politics & Government Politics & Social Sciences Social Sciences