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.
Patent leather is made with chemicals to give it a shiny, reflective surface. Patent leather is usually black in color and most popularly used in dress making and dancing shoes. It's usually light and thin and is made from leather of a calf.Leather has many uses and comes in many forms, from thick, sturdy cow hide leather and harnesses to soft kid leather for gloves.Patent Leather is made like any other leather except in the last stage it is coated with a glossy finish to give the shiny look.Patent leather started as a superior grade of fine grain leather that passes through specific process to achieve its classy glossy look that is considered sophisticated. Leather is actually made from animals and most often it is made from cow. 2  Skin is removed by skill workers who cut it carefully to preserve its integrity. 3  Any marks or cuts on the skin affect the quality. 4  Soon after the removal of the skin it begins to decay, so immediately it is preserved in salt.