Leachate: Leachate is liquid waste that is produced when water percolates through the layers of a landfill, picking up contaminants from the decomposing waste. It can be harmful to soil and groundwater if not properly managed.
Methane gas: Landfills produce methane gas as organic waste decomposes in an oxygen-deprived environment. Methane is a potent greenhouse gas that contributes to climate change.
Liner system: A liner system consists of multiple layers (such as clay, plastic, and geotextile) placed at the bottom and sides of a landfill to prevent leachate from seeping into the surrounding environment.