In reality, however, inequalities have persistently grown, to the point where today the richest 1% of the world's population own almost half of the global wealth and that same 1% also emit more CO2 than the poorest half of the planet.

Dumb argument for a tax in the EU.
If you earn 45000€ or more per year (post-tax) you are in the 1%. (According to this)
That sure is a nice wage, but it's definitely not rich and employees with a degree are not the people we should be taxing even more.

Also this:

The richest 1% of the planet own nearly half of all wealth. These same ultra-rich emit more CO2 than the poorest half of the planet.

So 45000€ is ultra-rich?

Here is the direct link to the initiative: https://europa.eu/citizens-initiative/initiatives/details/2023/000006_en

It seems like you can't sign it yet though. Does anyone know how long it usually takes until they are signable after registration?

I'll be the one to pop the bubble. All this will do: people will move their assets outside the EU, making tax havens even richer.