Entry Barriers To Industrial Organization -- See Barriers to entry (Industrial organization) Here are entered works on technological, economic, or legal conditions of a market which raise the costs of firms wanting to enter the market above those of firms already in the market, or which otherwise make new entry difficult.
Environment Human -- See Human ecology Here are entered works on the relationship of humans to the natural environment. Works on the relationship of humans to their sociocultural environment are entered under Social ecology. Works on the composite of physical, biological, and social sciences concerned with the conditions of the environment and their effects are entered under Environmental sciences. Works on the interrelationships of organisms and their environment, including other organisms, are entered under Ecology.
Environmental Action Groups -- See Green movement Here are entered works on the movement that embraces a political culture and lifestyle focused on environmental and other issues, such as ecological accountability, grass roots democracy, and pacifism, often based in a separate political party.