All forms of collective behaviour that, in their discourse and in their practice, aim at correcting destructive forms of relationship between human action and its natural environment, in opposition to the prevailing structural and institutional logic.
(Manuel Castels. 1997. "The Greening of the Self: the Environmental Movement." The Power of Identity. Oxford: Blackwell, 112..)
Environmentalism generally promotes post-materialist goals such as self-expression, esteem, and aesthetic satisfaction, as opposed to materialist goals such as economic growth and maintaining order.