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Purpose: Higher education institutions (HEIs) around the world are engaged in internationalisation efforts. Yet internationalisation per se is associated with significant pressures on the environment and environmental resources, which need to be addressed. This study aims to assess the opportunities, benefits and challenges associated with the internationalisation of universities at a global level. Design/methodology/approach: A total of 27 relevant case studies were extracted from the literature to illustrate how HEIs worldwide are ensuring sustainability in their internationalisation efforts. Findings: Through case studies of international HEIs, the study lists the opportunities, benefits and challenges associated with the internationalisation of universities at a global level and some of the measures that may be deployed to reduce the environmental impacts of their international activities. Originality/value: This study provides a welcome contribution to the literature because it outlines some of the works taking place at universities, where matters related to sustainable development are considered against a background of internationalisation efforts.