Between the 1950s and 1970s, Hong Kong experienced rapid economic growth and its population almost doubled. Many people lived in houses and squatter huts built on steep hillsides. This combination of urban development and the city's hilly terrain led to a high risk from landslides. But warnings for landslides didn't exist, and a number of severe and catastrophic landslides in the 1970s resulted in great loss of life and damage to properties.
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