Blockchain, or shared, distributed ledger technology, can play a key role in boosting climate action by solving many of the underlying challenges of the voluntary carbon market (VCM). Some of these challenges are simply due to the fact that most carbon credits are created in emerging markets, where people often face challenges verifying the ownership of assets, and the presence of intermediaries such as banks and credit card companies can be patchy to non-existent. Blockchain as a decentralized solution promises to tackle many of these problems.