If public transportation were included in this count, at nearly 20 700 jobs in 2010, it would represent the largest share of green jobs in the metro-region (Brookings Institution, 2011c). Because other local green economy studies in the Chicago Tri-State metro-region employ broader definitions of energy and waste-related jobs, this report presents an alternative categorisation method. Under this more expansive category definition of energy jobs, for example, job growth occurred more slowly in building-related activities than in activities related to energy or water and air.