Not all transactions have an estimated carbon footprint. For example, Withdrawals, Direct Debits, Transfers sent and received, or State Payments do not have this estimate.
Uncategorized transactions also do not have a Carbon Footprint estimate. The better your expenses are categorized, the better the estimate.
You can change the category of any transaction and/or purchase by accessing the transaction details and clicking on “Change category”. If you change a category, it may take some time for the system to recalculate and display the new estimate.