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As time approaches the 21st century the automobile has become our major source of mass transportation Everything about our culture and society has developed around this necessary form of travel However along with this necessity comes the issue of pollution to the environment These great gasoline powered vehicles have contributed greatly to the impurity of our environment The two prominent alternative fueled vehicles yet brought up are the Electric car EV and the Hybrid electric car HEV The ultimate clean efficient car is the EV a vehicle powered by an electrical motor which is powered by batteries and controlled by an on-board computer But there are questions about the mid-term viability of EV vehicles This is due to unresolved technical issues of on-board energy storage capacity high vehicle cost and infrastructure limitations eg lack of public charging stations repairreplacement facilities and battery recycling centers HEV vehicles are almost as clean as the EVs and have vehicle performance comparable to that of todays standard internal combustion engine vehicles More important such performance appears to be available in the mid-term future eg 2002 and therefore represents a practical technically achievable alternative approach Some suggest we develop both the EVs and HEVs in parallel because many of the technical advancements can be shared and because either or both will be needed to achieve efficiency and clean air goals Unlike EV or the HEV vehicles motor vehicles generate more air pollution than any other human made machine This air pollution or toxic mixture of chemicals released by motor vehicles is recognized as a major health hazard According to the American Lung Association this air pollution kills between 60000 and 120000 people in the United States each year and costs 93 billion dollars in medical bills Some of these air-polluting greenhouse gases that are emitted or attributed to gasoline powered vehicles are chlorofluorocarbon CFCs carbon dioxide CO2 nitrous oxide N2O methane CH4 and the precursors to tropospheric ozone -
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