Consume less in general and develop cooperatives that utilize local resources as efficiently as possible. This is going to become a necessity in the coming decades and the communities that start now will have a head start on the changes that will be required to survive in a much harsher world. This is why I said it's a social instead of technical problem. The neighborhood I live in is extremely affluent but other than churches has no other collective organizations. Places like that might weather the first few waves of instability but will eventually have to develop cooperatives just like everyone else. Resources are going to become more and more scarce so the communities that develop the skills to properly ration whatever is left to maximize the well being of their members will thrive, those that don't, well, just look at SF or other metropolitan areas, it ain't pretty.