Climate data governance is a key step in taking advantage of the opportunities offered by innovative financial mechanisms, based on the provision of data and indicators that can attest to the achievement of a country's climate targets and commitments. For example, green bonds require the bond issuer to communicate environmental or climate sustainability objectives to investors in a transparent manner, as well as to undergo external evaluation and review. Therefore, having a robust and clear monitoring and reporting system in place can help governments access new instruments and consolidate the operationalization of their climate action, in alignment with the targets set by their Nationally Determined Contributions (NDCs). The publication consists of four parts.