Dear Sandra,
Thank you for your message.
The 'world' value is calculated by combining the data from our data sources by applying the CAIT 2.0 methodology. The 'total' value is calculated by adding up the countries that are currently selected in the CAIT 2.0 interface.
The difference in value (if all countries are selected) is present, because the international emission data set does not include all countries. This why the 'world' value is slightly higher than the 'total' value.
I hope this helps.
Best,
The CAIT 2.0 Team