Interesting engineering website lists 21 sustainability innovations.
Let's pick #18: Fairphone. We'll start with the following circular economy diagram by Ellen MacArthur Foundation:

Looking at the right hand side of the diagram the best option would be to share the product or to extend its lifetime by proper maintenance. Fairphone claims that their design is repairable and modular.

On top of that you can select what accessories you want to include with your phone There’s no charger, no cable, and no earphones in the box, so you can keep using the accessories you already own. Actually at the same time design supports the 2nd best option in the circular economy diagram: reusability and redistribution.
Because the design is modular refurbishing is a natural option. Fairphone also uses fairtrade gold, recycled plastics and conflict-free minerals.
Factory workers get a proper contribution for their work. You can think fair when buying a phone next time.
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