Name the microbes employed to produce biogas.

Explanation

**Step-by-Step Solution:**

1. **Understanding Biogas**: Biogas is an alternative source of energy that is considered a clean fuel. It is primarily composed of methane, along with other gases like carbon dioxide (CO2), hydrogen, and hydrogen sulfide.

2. **Role of Microbes**: The production of biogas occurs through the decomposition of organic matter. This process is facilitated by specific types of bacteria known as methanogens.

3. **Methanogens**: Methanogens are a category of bacteria that produce methane during the decomposition of organic materials. They thrive in anaerobic (absence of oxygen) conditions, which are typically found in environments such as the digestive systems of ruminants (like cattle) and in biogas digesters.

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