First large greenhouse gas emissions trading scheme in the world
The European Union Emissions Trading System (EU ETS) is a carbon emission trading scheme (or cap and trade scheme) that began in 2005 and is intended to lower greenhouse gas emissions in the EU. Cap and trade schemes limit emissions of specified pollutants over an area and allow companies to trade emissions rights within that area. The ETS covers around 45% of the EU's greenhouse gas emissions. . As from 2027 road transport and buildings and industrial installation that fell out of EU ETS will be covered by a new EU ETS2.
https://en.wikipedia.org/wiki/European_Union_Emissions_Trading_System