Well, there is obvious bias but Fairphone itself has lots of articles about their research into their environmental impact:

https://support.fairphone.com/hc/en-us/articles/208539846

https://www.fairphone.com/en/research-resources/

It was slightly tongue in cheek, but the point relates to fixed versus marginal environmental costs of production.

It’s sort of a backwards way of thinking about the “Marginal Abatement Cost Function” (MAC) which is non-linear at the point you decide to go from producing 1 unit of output to shuttering the factory entirely.

At the point where you are producing 36 million phones, the marginal economic cost is at its lowest. The marginal economic cost of your first unit, by comparison, is a massive step function.

Which is why I started by saying it’s a morose way of looking at things, because you get stuck in a local minimum that way.