Ecosystem
The term ecosystem was first used in 1935 in a publication by British ecologist Arthur Tansley. Tansley devised the concept to draw attention to the importance of transfers of materials between organisms and their environment. He later refined the term, describing it as "The whole system, ... including not only the organism-complex, but also the whole complex of physical factors forming what we call the environment". Tansley regarded ecosystems not simply as natural units, but as "mental isolates". Tansley later defined the spatial extent of ecosystems using the term ecotope.
Free-market environmentalism
Recent arguments in the academic literature have used Friedrich Hayek's concept of a spontaneous order to defend a broadly non-interventionist environmental policy. Hayek originally used the concept of a spontaneous order to argue against government intervention in the market. Like the market, ecosystems contain complex networks of information, involve an ongoing dynamic process, contain orders within orders, and the entire system operates without being directed by a conscious mind. On this analysis, species takes the place of price as a visible element of the system formed by a complex set of largely unknowable elements. Human ignorance about the countless interactions between the organisms of an ecosystem limits our ability to manipulate nature. Since humans rely on the ecosystem to sustain themselves, it is argued that we have an obligation to not disrupt such systems. This analysis of ecosystems as spontaneous orders does not rely on markets qualifying as spontaneous orders. As such, one need not endorse Hayek's analysis of markets to endorse ecosystems as spontaneous orders.