A quick comparison: first Google result says we'd need to sequester 20 billion tonnes of CO2 a year to achieve net zero without any other reductions. Another fi

A quick comparison: first Google result says we'd need to sequester 20 billion tonnes of CO2 a year to achieve net zero without any other reductions. Another first Google result says the total worldwide reserves of copper amount to 890 million tonnes. Essentially it's either going to be so cheap that trying to use it as currency is impractical, like carrying around pennies, or so overvalued that you'd surely destroy the economy? You'd have to use paper currency backed by tonnes of carbon - which is just a roundabout way to arrive at carbon credits!