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An analysis of trees in the Chicago region of Illinois reveals that this area has about 157,142,000 trees with tree and shrub canopy that covers 21.0 percent of the region. The most common tree species are European buckthorn, green ash, boxelder, black cherry, and American elm. Trees in the Chicago region currently store about 16.9 million tons of carbon (61.9 million tons CO 2 ) valued at $349 million. In addition, these trees remove about 677,000 tons of carbon per year (2.5 million tons CO 2doi:10.2737/nrs-rb-84 fatcat:yzqoabu6orhwff6rlq7iowi2p4