On the State of the natural environment can be judged from the point of view of the natural evolution of nature and position of the person. We'll talk about anthropogenic effects on the natural environment.
In the literature there are following the State of the environment:
1) natural, not altered the immediate human activities (local nature is only a very weak indirect effects from human activities);
2) equilibrium is the speed of recovery is greater than or equal to the rate of anthropogenic disturbances;
3) crisis is the rate of anthropogenic disturbance is greater than the rate of natural self-healing systems, but still is not indigenous to their changes;
4) critical — is the first replacement reversible until the existing ecological systems on less productive;
5) catastrophic — there is already trudnoobratimyj the docking process of low productivity of ecological systems;
6) State of collapse is an irreversible loss of the biological productivity of ecological systems.
Of course, the best form of the natural environment is a natural. In this case, the natural environment, more precisely, the objects of the environment have a relatively constant average content of their components and connections. Daily, seasonal and long-term fluctuations in the concentrations of the components do not exceed, in which disrupted the normal functioning of the objects surrounding sredy.Krupnye changes of environmental parameters are evolutionary in nature. Sign of the last quarter of the XX century. is offensive crisis phase of the natural environment of the planet, and in some regions - the critical and catastrophic, that somehow due to the large energy and technical equipment cheloveka.Izvestno that the main factor that has a negative impact on the natural environment is a factor of its pollution. Usually characterized by the appearance of the term contamination of the environment as part of the new components, caused either by human activities, or some natural phenomena. We give the following definition of pollution of nature: it is introducing into the environment or the emergence of new in it, usually not typical for her physical, chemical, biological, mechanical, or information agents, or the excess at the material time the average annual level (within its extreme fluctuations) concentrations of these agents, often resulting in negative environmental consequences. You can give and less scientific, "everyday" definition of pollution: it's something that is not in the wrong place at the wrong time and in the amount of what is natural to the environment, which puts it out of balance system and differs from the usual observed normy.Zagryazneniya environment may be classified differently: 1) depending upon the nature of pollution sources (physical, chemical, biological, mechanical, etc.) 2) in relation to the role of human (anthropogenic pollution and natural pollution resulting from natural hazard processes, for example as a result of a volcanic eruption); 3) depending on the nature of ecosystems and natural areas (pollution of the hydrosphere, atmosphere, and so pedosphere. D.) 4) in connection with the location of the territorial system (pollution is local, regional, global, and so on. Etc..), 5), depending on the history of pollution pollution secrete primary, that is. E. Arrival on Wednesday pollutants directly formed in the course of natural and anthropogenic processes and secondary pollution, ie. e. synthesis of hazardous pollutants in the physical and chemical processes (often from non-toxic components formed highly toxic phosgene gas or generally safe freon in statosfere undergo photochemical reactions, giving a chlorine ion - the destroyer of the ozone screen, and t. etc..). Naturally, this classification can be much more fractional. Thus, the only physical pollution can be heat, light, noise, electromagnetic, and so on. D.