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Trees provide many valuable ecosystem services: they reduce energy consumption, they trap and filter stormwater, they help clean the air by intercepting air pollutants, and they help in the fight against global climate change by sequestering carbon dioxide (CO2). At the same time, they provide a wide array of aesthetic, social, economic, and health benefits that are less tangible.

The Million Trees LA initiative intends to chart a course for sustainable growth through planting and stewardship of trees. The purpose of this study was to measure Los Angeles's existing tree canopy cover (TCC), determine if space exists for 1 million additional trees, and estimate future benefits from the planting. Highresolution QuickBird remote sensing data, aerial photographs, and geographic information systems were used to classify land cover types, measure TCC, and identify potential tree planting sites. Benefits were forecast for planting of 1 million trees between 2006 and 2010, and...