Composting household waste can reduce landfill waste by more than 50%. Different methods like home composting units or central facilities can be used. Home composting can save costs and reduce waste, but must be done properly to avoid odors. Central facilities can produce high-quality compost by controlling temperature. Composting whole waste requires removing metals and other materials first. A new clay-composting process at Murdoch University can fix heavy metals in compost, making them less harmful to plants.