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Chicago mayor Rahm Emanuel has launched round three of the Chicago Green Office Challenge.
The Green Office Challenge is a competition among local businesses to reduce energy, water, and waste while saving money. The activities should contribute to meeting the goals of the Challenge: to cut energy, water and materials use by 10 percent.
Since its first round was launched in 2008 by ICLEI, the model has been copied by 11 cities across the US.