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You can think of your Impact Identity as a climate passport, where your impact with Return will be tracked and represented as your on-chain carbon identity. The more you do, the more it evolves!
The Return Impact Identity is an ERC-721 token locked to a single address, corresponding to the climate impact of that address. Impact Identities are non-transferable, and evolve according to the impact of the owner's wallet.
function getTotalSBTOffset(uint sbtID) returns (uint totalOffset)
getTotalSBTOffset queries the Return Pool Manager contract to find all associated NFT's and returns the sum of their offset amounts.
function calculateTier(uint sbtID) returns (uint tier)