Is there a difference between natural gas and biogas?

Biogas and natural gas have essentially the same components. But, the two gasses are obtained in different ways. Biogas is produced when readily available organic materials (e.g., manure or food waste) break down. Natural gas is produced when ancient plants, tiny sea animals, and other organic materials break down in hard to access locations. Usually, natural gas has to be extracted from underground reservoirs. Natural gas can also be derived from petroleum refining.

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1. What is anaerobic digestion?
2. What is an anaerobic digester?
3. What is co-digestion?
4. What is biogas?
5. How is biogas generated?
6. What is digested material and what is it used for?
7. What types of organic materials produce biogas?
8. Is biogas a renewable energy source?
9. Can biogas replace fossil fuels?
10. How does biogas help reduce effects of climate change?
11. What types of facilities have anaerobic digesters?
12. Is there a difference between landfill gas and biogas?
13. Is there a difference between natural gas and biogas?
14. If I build a biogas system will it stink?
15. Are anaerobic digesters safe?