This study aims to explore how Westpac, a large Australian financial institution and leader in this field, developed and implemented a climate change sustainability strategy. Upon commencement of the research it was evident that this financial institution’s sustainability strategy had a long history and was much broader than ‘climate change’ initiatives per se. Correspondingly, the research team broadened the scope of their research and the term sustainability strategy was adopted and will be referred to throughout the rest of this document, unless the context specifically concerns climate change.