It is impossible for me to make a living and not have some travel involved. When I do not have to fly, I work from home and have done for over three and a half decades. Again, in my case, my job is not quite as you might imagine, making roles/jobs requiring less travel tough.
I have made several changes over the decades in other areas, largely around food, what we buy, where we buy it from, eating seasonally and locally (including produce) and eliminating red meat from our diet a long time ago. When home (as I have been for sometime - like you!) I cycle to do local (12 mile radius) errands. It is not the greatest effort known to mankind but I am doing my bit as best I can within the parameters of my life.
It is a valid question, and no-one should be afraid to answer it honestly. One of the greatest battles in life anyone will have is recognizing the principles v hypocrisy scale. It gets harder to manage as we get older; I have long had what I consider to be very strong principles and ethics, yet by buying a Nike product I am just another tiny cog in the machine. The only way I can deal with that, is to try and make as many choices as possible within ethical boundaries, and I find the easiest way to do that is with food. We are near farms, and as such, buying locally from local producers is more expensive but exponentially worth it. Plus I get on my bike to go pick it up!!!! I can only say/confess that I am far from the model of excellence and would put myself at around 65% striving to be better.
p.s. I found your earlier posts -along with Rorschach and Scara's on this topic- to be interesting and informative. This whole conversation has been cracking IMO.