More like 6%, roughly in line with its population share (5.4%). Not sure if that includes air travel, international air travel often isn't included in national statistics. https://edgar.jrc.ec.europa.eu/report_2025

If it's not significant, can I have 5% of your net worth?

If the EU mandated that products imported are made in a carbon neutral fashion, then importers of products will pay attention. Unfortunately it means higher prices, and the governments will get voted out of office by people voting for the populists selling the electoral promise of "Make Prices Low Again!"...

The EU is responsible for a lot more than that once you factor in emissions in other countries producing goods bought by people and businesses in EU countries.