Minecraft wiki entry for Renewable_resource, associated text: Many resources are renewably obtainable using certain main methods, such as farming. Others are obtainable by unusual item-specific methods, which can vary from building a cobblestone generator to harvesting obsidian from portals to collecting dragon breath into a bottle. The renewable method to obtain an item is not necessarily the easiest, fastest or safest, and may in some cases be highly impractical.