In this section, we reflect on our learnings about fossil fuels, focusing on coal, petroleum, and natural gas. These resources were formed from the remains of dead organisms over millions of years, making them exhaustible natural resources. It delves into the processes of carbonization for coal and the formation of petroleum from marine organisms. The section also outlines the products derived from coal (such as coke, coal gas, and coal tar) and petroleum (such as petrol, diesel, and lubricating oil), highlighting their significance in various industries and everyday life. Moreover, it stresses the urgency of using these resources judiciously due to their limited availability and the environmental impact of their consumption.