can someone explain to me why batteries are considered greener when they consist of lithium vs. fossil fuels?
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Making a battery is dirty, certainly more than the same weight of petroleum. **But you can use the battery over and over and over and over**. And the power for the battery can come from green sources such as solar or wind. Even if the battery power comes from a natural gas power plant, that power plant is many times more efficient and cleaner than the number of car engines it can replace via battery.
tl;dr making batteries is dirty, but the electricity to feed them is cleaner, and they get reused. **A lot**. So they come out way ahead.
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