Which one of the following statements about biogas is not correct ?

Biogas is a renewable energy source, not a non-renewable one. It is produced through the anaerobic digestion of organic matter such as cattle dung, agricultural residues, and municipal waste [2]. This biological process occurs in the absence of oxygen, where microorganisms break down the waste to produce a gas mixture. The primary component of biogas is methane (typically 50-75%), followed by carbon dioxide and trace amounts of other gases like hydrogen sulfide. Biogas is considered a clean fuel because it burns without smoke and leaves no residue, unlike traditional fuels like dung cakes or charcoal [2]. Because it is derived from organic waste that can be continuously replenished, it is classified as a sustainable and renewable energy resource. Therefore, the statement claiming it is non-renewable is incorrect.

Sources

1. [1] NCERT. (2022). Contemporary India II: Textbook in Geography for Class X (Revised ed.). NCERT. > Chapter 5: Print Culture and the Modern World > Biogas > p. 117
2. [2] Geography of India ,Majid Husain, (McGrawHill 9th ed.) > Chapter 8: Energy Resources > Bio-Energy > p. 30