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The Warming of Los Angeles By the 1990s, average temperatures in Los Angeles had risen to be 5 degrees Fahrenheit warmer than in 1940. This was due to the dramatic loss of Los Angeles County orchards and farmland in favor of buildings and roads. The increased concrete and asphalt served to absorb solar heat and heat up the surrounding atmosphere, causing a massive "urban heat island." Studies suggest that a massive planting of trees in the San Fernando Valley alone could lower average temperatures as much as 9 degrees Fahrenheit.
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