Thought experiment for saving our planet:
1. Every single product gets tagged with a CO2 footprint.
2. Everything you buy is saved in your digital identity. (which you own?)
3. There is a limit per year of how much CO2 you are allowed to produce.
4. If you exceed this limit, you're not allowed to do bigger purchases, like buying a flight. (buying groceries probably should still be allowed)

What do you think?

Doconomy is trying that with a credit card:

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