Since the mid-1900s, humans have been exerting an ever-increasing impact on the global nitrogen cycle. Human activities, such as making fertilizers and burning fossil fuels, have significantly altered the amount of fixed nitrogen in the Earth's ecosystems. In fact, some predict that by 2030, the amount of nitrogen fixed by human activities will exceed that fixed by microbial processes (Vitousek 1997).
1 Faux leather is man made fabric (usually polyester) that has been treated with wax, dye, polyurethane, or PVC (polyvinyl chloride) for color and texture that feel like real leather at a much lower cost.
Leathers are made from the skins of many animals but mainly cattle, goat, sheep and pigskins. Although there is a great variety of leather types, a leather can usually be put into one of three categories 1  :-. Aniline. 2  Semi-aniline. 3  Pigmented (protected).niline leathers feel like real skin-light and flexible-whilst a heavily pigmented (protected) leather can feel rather like plastic. Leather upholstery in cars is almost exclusively pigmented to protect it from years of heavy use, as are domestic upholstery leathers.