Fossil fuel is causing serious changes to the global climate and health problems. About 70% of all the oil goes to transportation and more than 90% of the energy for our transportation system comes from oil. One of the best ways to reduce environmental damage and have important public health benefits is to purchase green vehicles when and where it is available.

The 20th century was dominated by gasoline motor vehicles, but now in addition advanced technology vehicles that run on biodiesel, electricity, natural gas, are available on the market.

The electric vehicle is worldwide known as a zero emissions vehicle, but to speak frankly, it is an emissions elsewhere vehicle, since the electricity to charge the batteries is presently generated in an electrical generator that produce emissions. Nowadays the most efficient way to produce electricity is with a combined cycle natural gas fired electric generator.

After calculating the wheel energy efficiency of any car, it is clear that the electric vehicle is much more efficient and pollutes less than all kinds of alternative motors. From the perspective of emissions, electric cars are 10 times better than gasoline cars that produce a variety of emissions, including carbon dioxide, unburned hydrocarbons, lead.

Also the best advantage of powering cars with electricity from the grid is that we can generate the electricity in several ways, such as hydroelectric, wind, solar and not only from gas plants.

Furthermore all electrical generators that produce emissions are located far from cities where people live, and work at designed rpm's so to get best performance, high efficiency and lower emissions. Because the traffic jam, a car engine always works in bad condition, low rpm, high consumption, high emissions. In an electrical generator plant, you can control pollution much better than you can emissions from an automobile.

Gasoline engines deliver high horsepower only from 3.000 to 4.000 rpm range, and they have no reasonable torque at low rpm's. Electric motors are high energy efficiency and offer great acceleration without transmission or clutch at any rpm range, having reasonable torque from zero rpm to 10.000 rpm. So electric cars have higher efficiency and lower total emissions than the most efficient gasoline cars.

Because gasoline cars are worldwide known as best performance cars, to be confident, the transition to an electric economy would take many decades, and replacing most of the cars on the road with green vehicles will take more than 50 years, even if electric cars will be cheaper than equivalent gasoline cars.

Talking about mechanic parts, electric cars are very simple cars. The motor has only 1 moving part with direct transmission, no clutch, no motor oil, no filters, no sparks. That means that the only service require is for replacing tires, break pads, and general inspection.

Green vehicles often seem to be a little more expensive, but it is false. In a few months the higher costs of an electric vehicle will be paid from saving money in gasoline, maintenance and service, furthermore the biggest investment is in the large positive environmental impact.

The advantage of never visiting a gas station could be an inconvenient if range is too short. Electric cars are suited for point to point driving, around 30km (20 mile) from home. A 100km (60 mile) range is acceptable for a city car, it is unusual to drive more than 100Km (60 miles) in a day in a city. The only problem of electric car is the inability to take long trips, since there are no recharging stations on the way, and it takes 4-5 hours to charge batteries.

The electric vehicles mostly use lead acid batteries, but nickel metal hydride batteries or lithium ion batteries will be used in next future in order to get better performance and double range.

Hydrogen does not exist in nature, the most efficient way to produce hydrogen is by reforming natural gas (CH4) or water (H2O). the total efficiency of hydrogen produced from natural is about 55%, including all phase of production in new plants and the efficiency for a fuel cell is about 50%. The energy efficiency for the hydrogen fuel cell car is 30% not far from gasoline cars.

Someone suggested to produce hydrogen through electrolysis of water, but to tell you the truth, it is a very inefficient way to use electricity, the total efficiency of this process is the half of the efficiency if producing from natural gas.