What does your vision of a sustainable community look like? What would need to be changed in order for such vision to become reality?
It is hard for me to completely envision a sustainable community, because I believe that sustainability should be as local as possible - so sustainability can look different in every community. However, there are a few traits of a sustainable community that I think can apply across the board - 1) people helping each other and sharing what they have, creating a strong bond between people and using fewer resources; 2) a deep knowledge of the land a community is on and stake in its welfare, 3) flexibility and patience in trying new solutions, 4) cooperation with the seasons and nature's patterns, and 5) people who stay in their communities and pass down knowledge of the land to the generations after them. Reading Wendell Berry has really influenced my opinion on these things.
To relate this to the methane digesters video, my first thought was - why would we burn a greenhouse gas to create fuel when we have much cleaner ways to get energy? However, when I thought more about the "local sustainability" principle, I realized that energy systems like these would help create energy independence away from big fossil fuel companies, particularly in rural or developing communities who might not have immediate access to wind or solar energy. I need to be better at thinking about how sustainability solutions could help a wide variety of people in different situations.
To create sustainable communities like these, it's hard to say what exactly needs to be changed, but I can think of a few things: 1) localizing food systems and supporting farmers, 2) restorative ecological work, and 3) people getting out into the land surrounding them and getting to know each other. Americans in particular tend to pride ourselves on being "independent," but what we really are is dependent on huge corporations and unable to function without their products.