The small city of Kalundborg, 64 miles west of Copenhagen, was the first municipality to have engineered a symbiotic relationship between all its industries so that the excess heat, water, waste and other resources leftover become feedstock for other industries and farms, creating a closed loop system.

Throughout the town of 17,000 residents, inputs and outputs "weave together like strands of thread, creating a tapestry of efficiency," known as the Kalundborg Symbiosis.

(READ this story from Ensia.com)

Photo courtesy of Symbiosis Center