This book describes a personal journey, undertaken to develop an understanding of sustainability and climate neutrality in practice, while conceptualising delivery solutions using sustainability finance. Simultaneously it serves as a way to recognise and say a thank you to so many people the author had the pleasure and privilege to cross paths with.

This book is not an autobiography, rather it serves as a commentary on events during the author's career and is aimed at linking experience to challenging sustainability issues, as and where applicable, during the process of introducing conceptual solutions, both from an operational and a transformational view. It is especially with reference to the operational and transformational issues that digital transformation is introduced, leading to blockchain based solutions.

In this story the development of the sustainability toolbox is described and the content of definitions and opinions on sustainability shared. In-house sustainability development guidelines, developed long before the UN SDGs appeared in 2015, are also discussed.

The ten years in practice before the wine estate are summarized to illustrate that the experience existed to embark on the sustainability finance journey during the subsequent twenty years. The book endeavours to build a bridge between subsequent experience gained and being a quasi-textbook, as illustrated by the 20/Twenty framework in the final chapter.