Fossil fuels are energy resources such as coal, oil, and natural gas, formed from the remains of ancient plants and animals over millions of years under high pressure and temperature. Fossil fuels are a major source of energy globally but are also associated with environmental concerns like greenhouse gas emissions and climate change. Understanding their formation, distribution, and impact is critical in geology, energy studies, and environmental science.
Reference: Tissot, B. P., & Welte, D. H. (1984). Petroleum Formation and Occurrence. Springer.