Natural Gas | Bio Gas |
1. It is a fossil fuel | 1. It is a biofuel |
2. It is non-renewable | 2. It is renewable like solar or wind energy |
3. It is formed when layers of buried plants and animals are exposed to intense heat and pressure over thousands of years. | 3. It is produced by anaerobic digestion with anaerobic bacteria or fermentation of biodegradable materials such as manure, sewage, municipal waste, green waste, plant material, and crops. |