Purpose: The purpose of this study is to examine the effectiveness of education for sustainable development (ESD) approaches in English as a foreign language (EFL) in Japanese higher education. Design/methodology/approach: A content and language integrated learning (CLIL) University-level course was run over two separate semesters--the first as a lecture-based course and the second was a similar course that integrated ESD best-practice. A program effects case study was used to see if any significant changes could be measured between the separate semesters. A mixed-methods approach to data collection was used and student marks, survey results using values, beliefs and norms (VBN) model and reflection tasks were collected across the two courses. Findings: A meaningful change in the ascription of responsibility and personal norms was present in the ESD best-practice course. This shows that ESD best-practice integration into language teaching has a positive impact on student environmental VBN and more research is necessary for this area. Practical implications: ESD integrated into language teaching correlates positively with environmental behavior change according to the VBN-model. A new field of study is proposed, language education for sustainable development, to better integrate the disciplines of EFL and ESD. Originality/value: This study is looking at the integration of ESD in language teaching and CLIL based courses in Higher Education and, at present, there are no other studies of this kind.