· What basic entities are recognized or constructed by the discourse? For example, does it look at a forest and see an ecosystem, or does it see a source of lumber?
· What are its assumptions about relationships? Does it see humans as basically competitive or, on the other hand, cooperative? Ideas about gender, race, species, political power, wealth, and intellect are included here.
· What does the discourse say about agents and their motives: who are the main actors involved in any given issue, and what do they want?
· What key metaphors and other rhetorical devices are present in the discourse—such as Spaceship Earth or the commons?
· What difference does the discourse make—what effects does it have on the real world? To ascertain this last, we examine its impacts on politics, policy and institutions; its social and cultural impacts; the arguments of its critics; and the flaws within the discourse as revealed by evidence and argument. The scientific method is a measured, incremental, and systematic process of identifying a problem, collecting data, developing an hypothesis, establishing a tentative conclusion, testing it, and submitting the results and the methodology to others wa"rking in the same subject area, a practice called "peer review:"
lawmakers are faced with problems for which the public demands prompt solutions and cannot wait for definitive data, whereas science is patient and tentative. Science develops gradually and changes, but once public policy is set, it is hard to modify. Looking at the studies as a whole, the major controversy concerns the time scale. The so-called optimists believe that (1) the current situation in general is not quite so bad as the doomsayers make out, {2) continued scientific and technological ingenuity will keep the ecological wolffrom the door indefinitely, and (3) there are many social negative-feedback mechanisms (such as the economic marketplace, the impact ofmedia-propagated information on values, and the political process itself) that will promote gradual human adjustment to physical ·limits when and if it becomes necessary. Thus, to put it crudely, business as usual can continue for the foreseeable future, and to l~>Ok beyond that is borrowing trouble. The so-called pessimists believe, to the contrary, that (1) the situation is more urgent than most are willing to admit, (2) limits on our scientific and technological ingenuity and on our ability to apply it to the problems confronting us are already discernible, and (3) the negative-feedback mechanisms on which the optimists would rely have already begun to fail An ecosystem is any group of plants, animals, or nonliving things interacting within their external environment. Typically, ecologists study individual organisms (the life cycle of the organism, its requirements of its environment, its functioning in the environment); populations of organisms (including questions such as stability, decline, or growth in populations); communities of organisms; or the ecosystem as a whole (including the biogeochemical cycles of carbon, m:ygen, hydrogen, soil minerals, and energy).
ecosystems are "open" in the sense that they interact with everything else in the environment. In fact, the earth itself is an ecosystem commonly referred to as the ecosphere or biosphere.3