That was what I meant by my original reply. I don't see how we can go beyond small neighbourhood changes though.
For instance food security for the small town I live in would be a wonderful goal. We have allotments and a small community orchard already, lots of people grow fruit and veg in their gardens of course. We could appropriate scraps of land around the town to turn them over to growing food.
To be really secure we would have to appropriate nearby land for growing food for the town instead of for profit. That is never going to happen. Money and the law protect the land owners.
So even at the scale of a small town in Southern England things are hard.
Capitalism is a motherfucker.