Notwithstanding the need for common classifications, data sources also need to be mutually coherent. Currently-available sources, both from private and public sources, do not yet live up to this requirement. This is a significant concern for policymakers.
Data quality is also a concern due to the risk of “greenwashing”, where data are self-reported in a biased way to make an entity look better than is actually the case. Quality will therefore require attention from those providing data and deriving indicators or statistics needed for analytical purposes or policymaking.