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Fossil fuels are the primary energy source today, primarily derived from coal, oil, and natural gas.
The term 'fossil' indicates that these fuels come from once-living material, formed anaerobically without oxygen.

Formation: Formed in swampy areas where vegetation is covered by sediment. Over time, heat and pressure convert this vegetation into different grades of coal (peat, lignite, coal).
Usage: Combusted to generate electricity, notably in power plants.
Advantages:
- Low cost and high energy return on investment.
- Abundant in various countries.
Disadvantages:
- Releases impurities, including sulfur dioxide, contributing to air pollution.
- Produces significant carbon dioxide emissions.
- Generates residual ash that needs disposal.

Formation: Created in ancient oceans from microscopic life that is deposited on the ocean floor and subsequently covered by sediment.
Types: Includes crude oil and solid forms like oil sands and oil shales, which can be processed into liquid fuels.
Advantages:
- Liquid form allows for easy transportation.
- More energy-dense and cleaner compared to coal.
Disadvantages:
- Carries impurities, leading to pollution.
- Potential for oil spills during transportation.
- Contributes to greenhouse gas emissions.

Composition: Primarily methane, used for heating and power generation.
Advantages:
- Cleaner burning than coal and oil.
- Often regarded as the “clean fossil fuel” due to lower carbon dioxide emissions.
Disadvantages:
- Methane is a potent greenhouse gas if released into the atmosphere.
- Extraction processes (e.g., hydraulic fracturing) may cause environmental damage, including earthquakes and water contamination.

Carbon Emissions: The combustion of fossil fuels significantly raises atmospheric carbon dioxide levels, contributing to global warming.
Finite Resource: Fossil fuels are nonrenewable and unevenly distributed, leading to concerns about future availability.
Hubbert Curve: Illustrates the peak oil concept, explaining that fossil fuel extraction rates can decline over time, despite technological advancements.

Coal Reserves: Predominantly found in the US, Russia, and China.
Oil Reserves: Concentrated in the Middle East, notably in Venezuela, Saudi Arabia, and Canada.
Natural Gas Reserves: Majorly located in Russia, Iran, and Qatar.

The reliance on fossil fuels poses both an energy opportunity and environmental challenge, necessitating a future transition to renewable resources due to their finite nature.