When the organic matter present in the sanitary landfill decomposes, it generates.

Explanation: 

Sanitary landfill:

• A Sanitary landfill is an engineered method of disposing of solid waste on land.
• Disposal of solid waste on land in a manner that protects the environment, for example by spreading the waste in thin layers, compacting it to the smallest practical volume, covering it with soil by the end of each working day, constructing barriers to infiltration, and evacuating the gases produced.
• Landfill gas is generated from the decomposition of organic matter in the landfill.
• This gas consists of about 50% CH₄ (Methane), about 50% CO_2, and a small amount of non-methane organic compounds.

• Instead of allowing landfill gas to escape into the air, landfill gases are increasingly capturing, converting, and using the gas as an energy source

Additional Information Methods of disposal of solid waste:

1. Sanitary landfilling;
2. Composting;
3. Incineration and pyrolysis;
4. Uncontrolled dumping (or) Non- Engineered disposal;
5. Vermicomposting;
6. Biogas generation.