When software systems are integrated into our society, the economy, and the environment, they have far-reaching effects. Therefore, they should be designed for the sustainability of the socio-technical system they belong to. This requires a paradigm shift in the way in which we create software systems. Requirements Engineering (RE) is key to drive this change, which should start by raising awareness of the relationship of a software-intensive system with sustainability. The workbook at hand provides the instruments used to carried out the Sustainability Awareness Workshops we are using when working with companies.