Unfortunately the speed in electric cars is slower than on gas-powered vehicles.

Since the first launching in the early twentieth century, cars not only has change old Roman roads with longer and wider highways, but also gas station and stop-and-go traffic are become common phenomenons in our society. Because prices of oil rises and exhaust fumes causes violent life, electrical cars are becoming one of the best alternatives. Although the electrical cars give more advantages, unfortunately the speed is slower than gas-powered vehicles.That is the reason why in North America, almost cars in there is gas powered vehicles. Different from North America, electric cars are developed by some major manufacturers in Europe and Asia. Futhermore, the government of China give some incentive not only for car manufacturers, but also for buyers electrical cars. On the other hand, American manufacturers makes the electrical cars looks like motorcycle with seats two and three -wheelers.

Hi, Dioba, i have read your summary, overall, it is great. but, here some advice for you in order to improve your writing in the future,.,

BECOME COMMON PHENOMENON IN OUR SOCIETY/HAVE BECOME COMMON PHENOMENON IN OUR SOCIETY . Because OF prices of oil rises and exhaust fumes causesCAUSES violent life, electrical cars ...

UNFORTUNATELY , Although the electrical cars give more advantages, unfortunately the speed is slower ...
..., almost cars in there isARE gas powered vehicles.
Futhermore FURTHERMORE, the government of China giveGIVES some incentive not only for car manufacturers, (WITHOUT COMMA IF YOU USE FORM "NOT ONLY----BUT ALSO)but also for buyers electrialELECTRIC cars.

... American manufacturers makesMAKE the electrical cars looks ...

please make sure using singular and plural noun, there are several a reverse/ inappropriate ways when you use them in your summary

good luck