© 2018, The Regents of the University of California 2018. Since the industrial revolution, we have been living in a linear economy. Our consumer and “single use” lifestyles have made the planet a “take, make, dispose” world. This refers to a unidirectional model of production: natural resources provide our factory inputs, which are then used to create mass-produced goods to be purchased and, typically, disposed after a single use. This linear economy model of mass production and mass consumption is testing the physical limits of the globe. It is, therefore, unsustainable and a shift toward a circular economy is becoming inevitable.