We should be promoting the production, purchasing and consumption of sustainably produced local produce but instead we let fields be turned into residences, car parks or fake greenhouse. We need to implement initiatives (legal and educational) in order to promote local producers (farmers, fisherman, etc.) that utilise sustainable practices by providing support frameworks and educating/pushing locals to opt for local produce over imported items where possible. Promotion of sustainable Agri-Tourism practices and setups would be one way of doing this while also promoting a new form of tourism and supporting local farmers. Subsidise the purchasing of agricultural land for individuals who wish to farm it through property tax rebates or government loans for farmland. These are just a few suggestions and I'm sure there are many more initiatives that your think tank can come up that will promote self-sustainability while also boosting the local economy (win-win).