This paper considers whether the promotion of an environmental ethic in schools is compatible with the political liberal's commitment to neutrality. A new account of the implications of John Rawls's political liberalism for the basic structure of education is developed. The prima facie incompatibility of political liberalism and the promotion of an environmental ethic is misleading. Rawls's political liberalism requires -as a matter of intergenerational justice - the promotion of the sustainability virtues. Moreover, it permits the promotion of greener ideals.