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 An electric car is an automobile which is propelled by electric  motor(s), using electrical energy stored in batteries or another energy  storage device. Electric cars were popular in the late-19th century and  early 20th century, until advances in internal combustion engine  technology and mass production of cheaper gasoline vehicles led to a  decline in the use of electric drive vehicle. The energy crises of the  1970s and 80s brought a short lived interest in electric cars, but in  the mid 2000s took place a renewed interest in the production of  electric cars due mainly to concerns about rapidly increasing oil prices  and the need to curb greenhouse gas emissions. As of September 2011  series production models available in some countries include the Tesla  Roadster, REVAi, Buddy, Mitsubishi i MiEV, Nissan Leaf, Smart ED, and  Wheego Whip LiFe. The Leaf and the i MiEV, with worldwide cumulative  sales of more than 15,000 units each, are the top selling  highway-capable electric cars by September 2011.
Electric cars have several potential benefits as compared to  conventional internal combustion automobiles that include a significant  reduction of urban air pollution as they do not emit harmful tailpipe  pollutants from the onboard source of power at the point of operation  (zero tail pipe emissions); reduced greenhouse gas emissions from the  onboard source of power depending on the fuel and technology used for  electricity generation to charge the batteries; and less dependence on  foreign oil, which for the United States, other developed and emerging  countries is cause of concerns about their vulnerability to price shocks  and supply disruption. Also for many developing countries, and  particularly for the poorest in Africa, high oil prices have an adverse  impact on their balance of payments, hindering their economic growth.