If the Sun were entirely composed of coal, then the energy of burning this coal would be enough to maintain the current solar radiation for about 5,000 years. But the Sun has been shining for many billions of years. If coal were burned in the “solar oven”, it would have gone out long ago. Other chemical processes differ little from combustion: they also do not provide enough energy to provide radiation from the sun.
Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.