Waste management accounts for a comparatively very high share of national GHG emissions in several countries worldwide. Emissions of methane following the disposal of waste in landfill account for a large share of GHG emissions from waste management. Solutions aiming at reducing such emissions are applied at the landfill site or before the waste disposal at the landfill. These solutions may include: Sustainable landfill management: Landfill management revolves around the control of both leachate and gas, to prevent harm that might arise from their escape, and to recover energy from landfill gas (LFG). Some examples of landfill management technologies: LFG extraction (using wells and blowersl LFG is then flared or use in gensets); methane oxidation layers (using methanotrophic bacteria that oxidate CH4 under aerobic condtions into CO2 and H20); landifll aeration (injection of air into landfill sites to help break down waste, whilst minimising the release of LFG and leachate). Waste sorting: The process by which waste is separated into different elements. Waste sorting can occur manually at the household and collected through curbside collection schemes, or automatically separated in materials recovery facilities or mechanical biological treatment systems. Waste recycling: Process of converting waste materials into new materials and objects. Recyclable materials include many kinds of glass, paper, cardboard, metal, plastic, tires, textiles, batteries, and electronics. Recycling a material produces a fresh supply of the same material (e.g. used office paper converted into new office paper, used polystyrene foam into new polystyrene, etc.). Other materials such as metal cans, can be remanufactured repeatedly without losing their purity. Valuable materials from complex products (e.g. lead from car batteries, gold from printed circuit boards, etc.) are also recycled. Organic waste composting: Another form of waste recycling. Decomposition of organic waste (e.g. fruits, vegetables, plants, yard wastes, etc.) by microorganisms naturally present in the organic matter and soil into an earthy substance rich in soil nutrient known as compost, which is used as organic soil fertilizer. Waste reuse: Reuse is the practice of using a material over and over again in its current form by finding alternate uses for an item rather than disposing or recycling it. Some common examples include used household items like books, magazines, clothing, kitchen wares, etc.