# Resources

* [Accounting for carbon emissions caused by cryptocurrency and token systems](https://arxiv.org/ftp/arxiv/papers/2111/2111.06477.pdf) - [Crypto Carbon Ratings Institute (CCRI)](https://carbon-ratings.com/)
* FungyProof [NFT NRG Matrix](https://github.com/FungyProof/nrg-matrix) 
* [Carbon.Fyi NFT Calculator](https://carbon.fyi/learn)
* [Patch.io BTC & ETH Calculator APIs](https://www.patch.io/products/insights) 
* [The Complicated Relationship Between Ethereum-based NFTs and the Environment](https://www.alexandrarubio.com/nfts-and-the-environment/)
* [Guidance for accounting and reporting electricity use and carbon emissions from cryptocurrency](https://cryptoclimate.org/wp-content/uploads/2021/12/RMI-CIP-CCA-Guidance-Documentation-Dec15.pdf) - Crypto Climate Accord