> The highest impact things an individual can do, roughly in order are: Don't have children. Don't own a car. Don't fly internationally. Don't eat meat. Don't eat dairy. Don't eat imported food.

You can have a still vastly bigger effect by affecting the footprint of others.

Re GP context, even with a low income you might get a lot done in activism / community organising, it might also make you feel more fulfilled as you are fighting to save the planet.