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Social-ecological systems are based on the concept that humans are a part of—not separate from—nature. [8] This concept, which holds that the delineation between social systems and natural systems is arbitrary and artificial, was first put forth by Berkes and Folke, [9] and its theory was further developed by Berkes et al. [10] More recent research into social-ecological system theory has ...
An air separation plant separates atmospheric air into its primary components, typically nitrogen and oxygen, and sometimes also argon and other rare inert gases. The most common method for air separation is fractional distillation. Cryogenic air separation units (ASUs) are built to provide nitrogen or oxygen and often co-produce argon.