Globally, transport accounts for around 14 per cent of CO2 emissions and over 50 per cent of the world's oil consumption.
Globally there are about 850 million vehicles, on average 13 people in 100 have a car.
In the United States it is 60 in 100, in India and China it is less than one.
If, by 2050, with a world population of 9 billion, we were to reach an average of half of the US level, there would be almost 3 billion cars.
Electric cars are generally more expensive than gasoline cars. The primary reason is the high cost of car batteries.
US and British car buyers seem to be unwilling to pay more for an electric car. This prohibits the mass transition from gasoline cars to electric cars.
A survey taken by Nielsen for the Financial Times has shown that 65 per cent of Americans and 76 per cent of Britons are not willing to pay more for an electric car above the price of a gasoline car.
Also a report by J D Power and Associates claims that about 50 per cent of US car buyers are not even willing to spend more than $5,000 on a green vehicle above the price of a petrol car despite their concern about the environment.
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Check out these 20 STUNNING green cars
Photographs: Stephane Mahe/Reuters
The Friendly prototype electric vehicle in the Heuliez plant in Cerizay, western France.
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Photographs: Mark Blinch/Reuters
The Chevrolet Volt electric car at the North American International Auto Show in Detroit.
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Photographs: Issei Kato/Reuters
"Bamgoo", an electric car with a body made out of bamboo, is displayed in Kyoto, western Japan.
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Photographs: Fred Prouser/Reuters
A Tesla Model S electric vehicle in Hawthorn, California.
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Photographs: Eric Gaillard/Reuters
The all-electric concept car 'My Car' produced by the Newteon Company at the EVER Monaco, a trade show dedicated to Ecological Vehicles and Renewable Energies, in Monte Carlo.
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Photographs: Benoit Tessier/Reuters
A Cleanova II electric car in the courtyard of the Economy ministry in Paris.
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Photographs: Lucas Jackson/Reuters
Mitsubishi Motors North America Inc. President and CEO Shin Kurihara speaks in front of a Mitsubishi iMiev electric car.
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Photographs: Eric Gaillard/Reuters
A man walks past an electric car at the EVER Monaco, a trade show dedicated to Ecological Vehicles and Renewable Energies, in Monte Carlo.
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Photographs: Jacky Naegelen/Reuters
The Citroen's C Cactus electric concept car at the Paris Mondial de l'Automobile.
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Photographs: Charles Platiau/Reuters
Paris Autolib' electric cars are put on display in Vaucresson, west of Paris.
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Photographs: Steve Fecht/Reuters
The Project P.U.M.A., an electric two-seat prototype vehicle with two wheels drives up the 18th Street in New York.
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Photographs: Vincent Kessler/Reuters
A F-City electric car constructed by FAM Automobiles in eastern France.
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Photographs: Mario Anzuoni/Reuters
The Nautilus E-30 electric truck is seen at the port of Los Angeles.
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Photographs: Stefan Wermuth/Reuters
An electric car connected to a charge spot in central London.
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Photographs: Mike Blake/Reuters
The Aptera 2e electric vehicle is driven in Carlsbad, California.
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Photographs: Danny Moloshok/Reuters
The fully-electric MINI - the zero-emissions MINI E - is taken on a test drive on Rodeo Drive in Beverly Hills.
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Photographs: Reuters
The new-generation Revai electric car is seen near the Indian Parliament building in New Delhi.
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Photographs: Denis Balibouse/Reuters
The Brabus Electric Drive Smart.
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Photographs: Mark Blinch/Reuters
The Myers Motors NmG all electric car is test driven during the North American International Auto Show in Detroit.
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