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In a circular economy, waste is not viewed as a burden to be discarded, but rather as a valuable resource to be repurposed and reintegrated into the production cycle. This paradigm shift is exemplified by the partnership between the city of Kalundborg, Denmark and local industries. In Kalundborg, the byproducts of one company become the raw materials for another, creating a complex web of resource sharing and recycling. For instance, a power plant’s excess steam is captured and used to heat thousands of local homes, while its ash and gypsum waste are repurposed into cement and drywall by nearby manufacturers. This symbiotic relationship reduces the consumption of virgin resources, minimizes waste, and lowers greenhouse gas emissions. The Kalundborg Eco-industrial Park demonstrates that by rethinking waste and fostering collaboration between industries, we can create a more sustainable and resilient economy. This model of industrial symbiosis has inspired similar projects around the world, showcasing the potential of circular economy principles to transform our production and consumption practices. By designing out waste, keeping materials in use, and regenerating natural systems, we can decouple economic growth from resource depletion and environmental degradation, paving the way for a more sustainable future.