Sustainability is becoming an increasingly important driver for which decision makers – consumers, corporate and government – rely on principled, accurate and provenanced metrics to make appropriate behavior changes. Our assertion here is that a Sustainability Hub which manages such metrics together with their context and chains of reasoning will be of great benefit to the global community. In this paper we explain the Hub vision and explain its triple value proposition of context, chains of reasoning and community. We propose a data model and describe our existing prototype. Categories and Subject Descriptors H.4.3 [Communications Applications]: Information browsers General Terms Management, Measurement, Design, Keywords sustainability; metrics; context; chains of reasoning; community; information management; provenance