Does carboncoin need to be crypto?

In the realm of cryptocurrency and finance, one of the emerging concepts that has garnered significant attention is CarbonCoin. However, I must ask a pertinent question: does CarbonCoin necessarily have to be cryptographically based? The choice to adopt a cryptographic foundation for a currency or asset often revolves around the desired level of security, anonymity, and decentralization. CarbonCoin, with its stated goals of promoting sustainability and reducing carbon emissions, may find other methods to achieve its objectives without necessarily relying on cryptography. Therefore, I pose the question: is cryptography a prerequisite for CarbonCoin, or could it potentially flourish without it?