Education is presented with a challenge when faced with criticism of modern science and adoption of a pluralistic view of environmental education and education for sustainable development. In dealing with this challenge, a practical understanding inspired by the later works of Ludwig Wittgenstein is suggested as a complement to more traditional theoretical and analytical responses. Through reminders of how criticism appears in everyday practice, the article shows that criticism does not necessarily have to be understood solely by reference to specific theoretical positions, but can also be seen in terms of the diverse ways that human beings react morally, encounter different norms and conduct ethical reflection. In such a practical understanding, the question is not whether the criticism is correct or not in absolute terms but rather whether the opinions and perspectives have significance in people's lives. Criticism of modern science does not therefore appear to be a reason to exclude modern science, the proposal here being to acknowledge and embrace the criticism and the alternative views put forward by the critics. By means of a practical understanding, the opposition expected between criticism and pluralism can be dissolved, rather than solved.