Green roof
Randy Hawke, facilities excellence architect for the 21st Space Wing, checks one of the many sedum plants covering most of the 21st Space Wing Headquarters building 19,000 square foot roof. The green roof, installed in 2007, is designed to reduce energy consumption and rainwater runoff, and extend the life of the roof, ultimately saving taxpayer dollars. (U.S. Air Force photo/Lea Johnson)
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