The Olympic Games in Vancouver have a number of green elements. One of the more interesting elements is the conversion of sewage to heat and to warm water. The sewage is drained and then sent through a heat pump that transfers thermal energy to hot water. This heats provides 70% of the annual energy needs needs for the Olympic Village. Pipes buried under the street help transfer the hot water to the buildings. After heating the pipes and water, the sewage is sent back to the sewer system for treatment. This is only one of numerous elements such as green roofs, water recovery systems, transportation systems, group gardens, rooftop solar collectors, and other unique features.
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