# 2.1. CO2 Allowances

Carbon allowance is a term used for a certificate or permit that represents the legal right to emit one tonne of carbon dioxide or equivalent greenhouse gas.

![Carbon Market](https://1530960399-files.gitbook.io/~/files/v0/b/gitbook-x-prod.appspot.com/o/spaces%2FSVItBqtjnTJOTtCbbMSF%2Fuploads%2FAQpI98gR6hpXSwp2XRHq%2F5.png?alt=media\&token=db934b91-bdc1-4148-a09e-809130adbe0b)