CO2 is fungible once it is in the atmosphere. There is no law of physics which says what can and cannot - only assumptions. Although it is a matter of scales gi

CO2 is fungible once it is in the atmosphere. There is no law of physics which says what can and cannot - only assumptions. Although it is a matter of scales given implementation details. Technically we turn fossil carbon into food indirectly all of the time with fertilizer and fueling agricultural vehicles but again implementation level details. We could also subsitute non-fossil sources or make it regenerative even though it wouldn't be that practical. Somebody with far too much funding and power in the literal energy over time sense could theoretically be a smartass jerk and start sequestering enough CO2 over time that lack of carbon starts to be a threat. In practice it would be less of a threat than being crushed to death by massive stacks of dollar bills.