What I've done:
- designed and built a house on renewable energy
- designed and built a windmill
Unfortunately both of these I have had to abandon, the former because it is on the wrong continent compared to where I am today, the latter because of permitting hassles.
- I do have the maximum surface of the roof covered in solar panels, a good 2500W peak.
- transport myself everywhere I can using bicycle / e-bike
(< 30 km, sometimes much more than that if I'm not in a hurry)
- eat very little - hardly any, actually - meat / poultry / fish
That still leaves a ton of room for improvement but as long as I'm living in my current situation I personally can't do a whole lot more for a variety of reasons, and I would if I could.
I have fortunately been able to stop flying completely, all of our work is now remote and we are pushing hard to keep it that way (when before our customers demanded on site visits all over europe).
Compared to 1 year ago my energy usage is probably about half, compared to 10 years ago it is probably less than 25% because this is a much more temperate climate.
So, what have you done?