The 2030 Agenda has pushed practitioners as well as academia to renew their efforts on promotingsustainability, e.g. in how digital technologies can support cities to improve their environmentalperformance. However, as scholars focus their attention on the positive outcomes of implementation,they often neglect the environmental impact of the artefact itself. We present a study of a Green ISimplementation – a municipal Internet of Things (IoT) solution which was expected to decrease thecarbon emissions produced by urban waste collection in Sweden. Using a mixed methods approach,we present qualitative findings from interviews & project meetings as well as quantitative findingsfrom a Life Cycle Assessment (LCA). We find that (1) the environmental impact of the connectedlitter-bins – however small – is not necessarily offset by any significant benefits, and (2) the mostsignificant way for the stakeholders to reduce environmental impact is to utilize more ecologicallyfriendly trash bags.