Maybe you are living in the wrong village - what would you classify as unsustainable? We might be talking about different things. I've just checked, and where I live has a somewhat similar size. The local town might have 2000 inhabitants, the villages around maybe average at around 200 people. There's a train station. There used to be several saw mills (I would like to see them return). Everybody is somehow connected to small scale agriculture, people keep sheep, goats, grow several field crops, tend home gardens, and tend forest land. The largest agricultural operations I see around here are poultry farms and berry plantations, but they are far and few between in desolate places and not destructive or disturbing in their current extension.

What we see around here: when too many people are forced out of small scale farming by political or economic reasons, the landscape starts to overgrow and wildfires start getting larger. One factor here is that a lot of the land around here is multifunctional land: my indulgent equines clear a few hectares of land which are covered with a wood crop currently, sheep and goat keep brush and brumble under control and clear fields after harvest. I also harvest several kilos of mushrooms and herbs every year just walking around the farm. The alternative to this setup: send some guys with machines to clear the land twice a year or risk the whole lot of trees burning down with a wildfire. And to do this service in an otherwise severely underpopulated landscape I only need an internet connection to get some cash in with my halftime remote job.

Some of these rural traditions and the ways different species interact to tend the landscape sustainably and efficiently have gotten lost (and in some places never really existed), but a lot of knowledge is still intact or can be recovered, and mixed with appropriate modern tech you can create a sustainable lifestyle that works in places where you cannot grow big grain crops - learning how to do this sustainably is another factor of what I am doing here. And I see that also the locals are aware of the challenges around water and climate change, and a lot of new ideas are coming in from locals returning from abroad and foreigners moving in. Of course there's idiots, like everywhere, but I don't think it's all lost. I don't know about island life, might be very different from this?