The production of greenhouse gases has had an adverse impact on humans and their activities since the beginning of the industrial age. When fuel is burned, primary exhaust emissions such as nitrogen oxides, carbon monoxide, hydrocarbons, carbon dioxide and particulate matter are produced. Primary pollutants in the atmosphere react to produce secondary pollutants, leading to acid rain, photochemical smog, and tropospheric ozone depletion. Many of these pollutants have serious impacts on human health and the environment and may be minimized by various suggested approaches .