Some cities are looking to build greener convention centers after realizing that better efficiency for the giant halls can save money in the long term. Take the convention center in Santa Fe, N.M., that recently received a LEED Gold designation. The convention center was built on the site of the previous center, and 88% of the materials from the old building were recycled. It also sports a rooftop garden and a rainwater collection system that can feed 45,000 gallons of water into the irrigation system.

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