Over the past two decades, the European Union (EU) has been entrusted with a growing number of objectives and responsibilities. However, ensuring financing of related activities through the EU budget has often proven problematic, as this has long been capped at around 1 % of the Union's gross national income (GNI). During the preparation of the post-2020 EU multiannual financial framework (MFF), climate action, migration and border management were identified among the emerging priorities that required increased joint action and funding.
https://www.europarl.europa.eu/thinktank/en/document.html?reference=EPRS_BRI(2021)690586

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