Waste management practices differ by locality. When regulated landfills are full, they are topped with clay and a plastic shield to contain environmental runoff. Soil is added to the top regularly to lace the waste layer with dirt. Modern systems will also vent the methane produced by decomposing waste or save it to collect as a source of energy. It’s important for waste management facilities to continue to monitor landfills even when they close. This maintenance includes monitoring groundwater, adding more layers of soil and dealing with methane. Read the full article for more on landfill management.