From the Politics of Nature, p246:
The term does not differentiate between scientific ecology and political ecology; it is built on the model of (but in opposition to) “political economy.” It is thus used to designate, by opposition to the “bad” philosophy of ecology, the understanding of ecological crises that no longer uses nature to account for the tasks to be accomplished, it’s used as an umbrella term to account for what succeeds modernism according to the alternative “modernize or ecologize.”
From the Politics of Nature, p4:
Political ecology is said to have to do with “nature in its links with society.” But this nature becomes knowable through the intermediary of the sciences; it has been formed through networks of instruments; it is defined through the interventions of professions, disciplines, and protocols; it is distributed via data bases; it is provided with arguments through the intermediary of learned societies.
Castells on Environmentalism and Ecology
From The Power of Identity (The Information Age: Economy, Society and Culture, Volume II), pp 112-113:
By environmentalism I refer to all forms of collective behavior 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. By ecology, in my sociological approach, I understand a set of beliefs, theories, and projects that consider humankind as a component of a broader ecosystem and wish to maintain the system’s balance in a dynamic, evolutionary perspective.
In my view, environmentalism is ecology in practice, and ecology is environmentalism in theory . . .
From The Power of Identity (The Information Age: Economy, Society and Culture, Volume II), p 133:
The ecological approach to life, to the economy, and to the institutions of society emphasizes the holistic character of all forms of matter, and of all information processing. Thus, the more we know, the more we sense the possibilities of our technology, and the more we realize the gigantic, dangerous gap between our enhanced productive capacities, and our primitive, unconscious, and ultimately destructive social organization.