What is the fine-grained topic of the following text: A wide range of local businesses, social enterprises and community organisations active in the Merseyside region will be represented at the event, including food producers which save money and resources by using up leftovers to make new dishes, furniture upcyclers promoting reuse and reducing landfill, and urban farmers who use aquaponics to reduce land, water and energy use. Only return the topic.
Sustainable practices in local businesses and community organisations in the Merseyside region