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Are metal/chemical batteries “clean” though?

In the atmospheric climate context, possibly. But if we optimize only for that, is there not a potentially serious trade off in the likelihood of irresponsible disposal?

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You can greatly reduce the danger of improper disposal by implementing a https://en.m.wikipedia.org/wiki/Deposit-refund_system

That is an honor system. Hope. Promises, promises.

Honor? No, it's based on cold, hard cash; you charge upfront a fee (as if the person had dumped it illegally), then refund that fee if they properly dispose of it.

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