Biogas is produced by anaerobic digestion with methanogens or anaerobic organisms, who digest material inside a closed system, or perform fermentation of biodegradable materials. This closed system is called an anaerobic digester, bio-digester or a bioreactor. Proper use of waste material can be achieved through biogas. The complex material is digested and is acted upon by several methanogenic bacteria.
Enlist any four advantages of it.

Explanation

**Step-by-Step Solution:**

1. **Understanding Biogas Production**: Biogas is produced through anaerobic digestion, where methanogenic bacteria break down organic materials in the absence of oxygen. This process occurs in a closed system known as an anaerobic digester or bioreactor.

2. **Identifying the Components of Biogas**: The main components of biogas include methane (CH4), carbon dioxide (CO2), and trace amounts of hydrogen sulfide (H2S). Methane is the primary component that makes biogas a valuable fuel source.

3. **Listing Advantages of Biogas**:
- **Eco-Friendly**: Biogas is considered eco-friendly because it produces less pollution compared to fossil fuels. It helps in reducing greenhouse gas emissions.
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