I had some friends that tried this once - however in an ad agency format.
What they soon realized is that they severely limited their client pool by only going after clients wanting to do “green” work.
And of course - they were still competing on this niche work with all of the other so called “non-green” agencies who were also perfectly capable of executing a “green” campaign.
Speaking of “non-green”
I’ve always thought it a bid odd when people/firms label themselves as a “green” designer. (or whatever word you want to use…)
It seems to suggest that if you don’t call yourself “green” then you must not be considering sustainability in your solutions.
Which of course is untrue as the overwhelming majority of industrial designers want to do the best work possible - and that would include satisfying the design requirements in the most sustainable way possible.
ps. the ad agency business model didn’t last long.
cheers,
Rob