there's just no need for them, they aren't reducing the carbon output because they have more steps of transformation of energy that each one has less efficiency than a modern diesel engine.

size of the battery matters a lot, because the amount of time it's gonna burn for increases at least linearly with mass. once all the lithium oxide is formed it's not going to be dangerous any more.

and besides all that, we have the lowest amount of CO2 in the atmosphere we have measured in ice cores dating back thousands and thousands of years.

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