Environmentalism is a broad philosophy, ideology and social movement regarding concerns for environmental conservation and improvement of the health of the environment, particularly as the measure for this health seeks to incorporate the concerns of non-human elements. Environmentalism advocates the preservation, restoration and/or improvement of the natural environment, and may be referred to as a movement to control pollution. For this reason, concepts such as a Land Ethic, Environmental Ethics, Biodiversity, Ecology and the Biophilia hypothesis figure predominantly. At its crux, environmentalism is an attempt to balance relations between humanity and their broader organismic and biogeochemical milieu in such a way that all the components are accorded a proper degree of respect. The exact nature of this balance is controversial and there are many different ways for environmental concerns to be expressed in practice. Environmentalism and environmental concerns are often represented by the color green, but this association has been appropriated by the marketing industries and is a key tactic in the art of Greenwashing.