coal, oil, natural gas is _________ sources.{rewable}

Coal, oil, and natural gas are non-renewable sources of energy. The reason these sources are classified as non-renewable is that they are formed from the decomposed remains of ancient plants and animals over millions of years. Once extracted and used, they cannot be replenished on a human timescale.

Renewable energy sources, on the other hand, are those that can be replenished naturally in a short period of time, such as solar, wind, hydro, and biomass. The continuous consumption of coal, oil, and natural gas leads to depletion of these resources, and burning them also produces greenhouse gases, contributing to climate change. Thus, it is crucial to transition to renewable energy sources to ensure sustainable energy supply for the future.