The document discusses the history of industrialization and its impacts on urban form and the environment. It describes how the rise of factories concentrated pollution and public health issues in cities. In response, the urban parks movement and garden city movement emerged to incorporate green space and nature into urban planning. The urban parks movement established the first urban parks like Central Park in New York to serve as "lungs" for dense industrial cities. The garden city concept proposed self-contained satellite communities that balanced urban and rural advantages through zoning, greenbelts, and mixed land uses. Letchworth Garden City in England was an early example of this planning approach.
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