Overwhelming waste is one of the most compelling issues that contemporary environmental and sustainability education (ESE) should address. Understanding waste as an embodiment and offspring of ongoing colonial relations in the Capitalocene, I explore how ESE could perform a string figure with a wasted world by decolonizing more-than-human relationships. The intersections and tensions between colonialism, waste, and ESE are investigated, with a focus on the de/colonization of waste and child. Then, I integrate them with Korean stories in which wasted beings unsettle dumping colonialism and renew their entanglements with a more-than-human world. From their interpretation emerges a polysemous metaphor of waste-child as ambivalent figures and relations of a ruined world. The metamorphosis of waste-child suggests an imaginary praxis of becoming waste and feral, affirming ambiguity and liminality. I propose the futurity of ESE joining in the intertwinement of planetary legacy and colonial debris by multispecies critters for their un/common decolonization.