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Given the fact that the average life time for a car batter is 3 years and all of the batteries end up at a landfill at the end of their life time, how sustainable are electric cars in providing a cleaner environment in the future?

The common sense is that they are a much cleaner alternative to the gas engine, but how much more?

Given the fact that the average lifetime for a car battery is 3 years and all of the batteries end up at a landfill at the end of their lifetime, how sustainable are electric cars in providing a cleaner environment in the future?

Common sense says that they are a much cleaner alternative to the gas engine, but how much more?