Question

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the car is now the world's number one polluter. do you think it's possible  to make  it cleaner  and safer?  have you  heard  about  electric cars 

Answer 1

Yes I think it is possible, because our modern industry can make new investigations, which will help us to keep our environment in clean and safe atmosphere.
No I haven't heard about electric cars, but I think that there is no anything impossible to our modern researchers and scientists.