This document discusses the importance of teaching sustainability issues in language courses. It provides examples of development projects that impacted communities in Wales and Quebec. These cases illustrate the environmental, social, and linguistic impacts of large-scale projects. The document argues that language students should learn about these issues to understand their ethical responsibilities to future generations. It poses questions about what content students need and how languages can engage with sustainability in an interdisciplinary way. Overall, the document makes a case for incorporating sustainability topics into language teaching to better prepare students for future challenges.