Discuss several ways in which microorganisms can help in meeting the current fuel shortage. (150 words)

Mechanisms

• Yeast ferments sugars and starch into bioethanol, which can be blended with petrol.
• Anaerobic bacteria digest cattle dung, sewage and food waste into biogas; upgraded biomethane can substitute CNG.
• Microalgae convert sunlight and carbon dioxide into lipids for biodiesel and can grow on non-arable land or wastewater.
• Microbial consortia produce biohydrogen through dark fermentation or photobiological pathways.

Wider gains

Microbial conversion valorises agricultural residue and municipal waste, reduces open burning and supports decentralised energy access.

Constraints

Feedstock collection, water, land competition, contamination, low yields, storage and commercial scale remain challenges. Sustainable lifecycle assessment and second-generation feedstocks are essential.

Keywords

bioethanol; biogas; biomethane; microalgae; biohydrogen; circular economy