The Million Tree Initiative refers to the ongoing environmental projects that multiple cities have individually committed to, aimed at expanding urban forestry through the planting of one million trees. Cities that are known to be currently involved in this initiative are: Los Angeles, Denver, New York City, Shanghai, London, Ontario, and Amherst, New York. A common motive shared between these participating cities is, according to their mission statements, the reduction of carbon dioxide in the air to reduce the effects of global warming.