ABSTRACT
Human influence has affected almost all marine ecosystems, and a significant portion of approximately 41% of terrestrial and marine habitats were affected by multiple forces acting simultaneously. Human influences on the hydrogen cycle show a wider degree of interconnection with all other biogeochemical cycles in the patterns of feedbacks through the terrestrial ecosystems than will be possible to thoroughly examine in the chapter. Some of the leading scientific minds writing about anthropogenic impacts on terrestrial ecosystems and on the biogeochemical cycles include Erle Ellis, Steward Pickett, Vaclav Smil, and William Schlesinger. For life to be maintained in the biosphere, chemical compounds are repeatedly and essentially being transferred between organisms, and from one part of the biosphere to another, through the biogeochemical cycling within ecosystems. Most of the fundamental biochemicals that are connected to life processes contain phosphorus linked to organic molecules by phosphate ester bonds.
