How do you describe fosssil fuel?

Fossil fuels are natural energy sources formed from the decomposed remains of ancient plants and animals, buried and subjected to heat and pressure over millions of years. The main types of fossil fuels include coal, oil, and natural gas. They are primarily used for energy production and transportation but contribute significantly to greenhouse gas emissions and climate change when burned. As a result, there is a growing shift towards renewable energy alternatives to mitigate environmental impacts.