At the other extreme are religious literalists who regard Man as the crown of creation with complete dominion over nature and the right to exploit its resources unreservedly. Similar, veiled, sentiments can be found among scientists. The Anthropic Principle, for instance, promoted by many outstanding physicists, claims that the nature of the Universe is preordained to accommodate sentient beings - namely, us humans.
Industrialists, politicians and economists have only recently begun paying lip service to sustainable development and to the environmental costs of their policies. Thus, in a way, they bridge the abyss - at least verbally - between these two diametrically opposed forms of fundamentalism. Still, essential dissimilarities between the schools notwithstanding, the dualism of Man vs. Nature is universally acknowledged.
Modern physics - notably the Copenhagen interpretation of quantum mechanics - has abandoned the classic split between (typically human) observer and (usually inanimate) observed. Environmentalists, in contrast, have embraced this discarded worldview wholeheartedly. To them, Man is the active agent operating upon a distinct reactive or passive substrate - i.e., Nature. But, though intuitively compelling, it is a false dichotomy.
Still, the "Law of the Minimum" - that there is a limit to human population growth and that this barrier is related to the biotic and abiotic variables of the environment - is undisputed. Whatever debate there is veers between two strands of this Malthusian Weltanschauung: the utilitarian (a.k.a. anthropocentric, shallow, or technocentric) and the ethical (alternatively termed biocentric, deep, or ecocentric).
First, the Utilitarians.
Utilitarians regard nature as a set of exhaustible and scarce resources and deal with their optimal allocation from a human point of view. Yet, they usually fail to incorporate intangibles such as the beauty of a sunset or the liberating sensation of open spaces.
"Green" accounting - adjusting the national accounts to reflect environmental data - is still in its unpromising infancy. It is complicated by the fact that ecosystems do not respect man-made borders and by the stubborn refusal of many ecological variables to succumb to numbers. To complicate things further, different nations weigh environmental problems disparately.
Despite recent attempts, such as the Environmental Sustainability Index (ESI) produced by the World Economic Forum (WEF), no one knows how to define and quantify elusive concepts such as "sustainable development". Even the costs of replacing or repairing depleted resources and natural assets are difficult to determine.
Efforts to capture "quality of life" considerations in the straitjacket of the formalism of distributive justice - known as human-welfare ecology or emancipatory environmentalism - backfired. These led to derisory attempts to reverse the inexorable processes of urbanization and industrialization by introducing localized, small-scale production.
Social ecologists proffer the same prescriptions but with an anarchistic twist. The hierarchical view of nature - with Man at the pinnacle - is a reflection of social relations, they suggest. Dismantle the latter - and you get rid of the former.
Biocentrists view nature as possessed of an intrinsic value, regardless of its actual or potential utility. They fail to specify, however, how this, even if true, gives rise to rights and commensurate obligations. Nor was their case aided by their association with the apocalyptic or survivalist school of environmentalism which has developed proto-fascist tendencies and is gradually being scientifically debunked.
The proponents of deep ecology radicalize the ideas of social ecology ad absurdum and postulate a transcendentalist spiritual connection with the inanimate (whatever that may be). In consequence, they refuse to intervene to counter or contain natural processes, including diseases and famine.