Many thanks for this very insightful article presenting so many efforts already on the way towards circular economy. That leaves hope indeed.

In particular, the initial sections points out the increase in entropy in the process of mixing materials such as various types of steel; an enourmous amount of energy would be needed to revert and separate.

However, it is perhaps worth considering to make a few steps back and reduce the amount of production and consumption as a whole: https://peter-wurmsdobler.medium.com/the-environmental-cost-of-material-affluence-24529fd8a9ed