that are emitted or attributed to gasoline powered vehicles are chlorofluorocarbon (CFC's), carbon dioxide (CO2), nitrous oxide (N2O), methane (CH4), and the precursors to tropospheric ozone - hydrocarbons (HC) and nitrogen oxides (NOx). These gasoline-powered vehicles are also a major source of carbon monoxide (CO). CFC's are the most potent greenhouse gases on a per-unit mass basis. They now contribute nearly 24 percent of the total global warming effect. While incremental improvements can be made in standard vehicles, regulators and auto makers have defined at least two new vehicle classes that may provide a step-wise improvement in emissions. These are the Electric Vehicle and the Hybrid Electric Vehicle. Unlike an EV, an HEV utilizes the intermittent operation of a small engine to assist a typically battery-powered electric propulsion system. The electric motor propels the front wheels at low speeds. At higher speeds the internal combustion engine takes over. When the engine drives the vehicle, it automatically charges the batteries used for the electric motor, therefore making the battery pack a lot smaller.
             EV and HEV vehicles are a lot more beneficial to the environment than internal combustion engines. The EV vehicles have a zero tailpipe emission. Another major problem of motor vehicles is its unsafe nature after its life dies out. Automobile junkyards, which litter the American landscape, contain thousands upon thousands of old broken up cars. From such junkyards are the problem of oil, lead, and battery acids, which enter the ground. However the lead in the batteries of electric vehicles is in a very stable form, unlike the trace amounts of lead in even unleaded gasoline and since electric vehicles do not
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