Which of the following is NOT an example of a renewable energy source?

Energy sources are broadly classified into renewable and non-renewable based on how quickly they can be replenished by natural processes. Renewable sources are sustainable because they are continuously available in nature, while non-renewable sources are finite and will eventually run out.

Let’s review the given options:

• 
  

  Wind energy is renewable because it relies on moving air masses driven by the Earth’s atmosphere and weather patterns. As long as the wind blows, this energy source can be harnessed.

  
  


• 
  

  Solar energy is renewable since it comes from sunlight, which is available every day. Solar panels capture this energy and convert it into electricity or heat.

  
  


• 
  

  Hydroelectric power is renewable because it uses the continuous flow of water in rivers and dams to generate electricity. The water cycle, powered by the sun, ensures that rivers keep flowing.

  
  


• 
  

  Coal, however, is not renewable. Coal is a fossil fuel formed from ancient plant matter buried and compressed over millions of years. Once extracted and burned, it cannot be replaced within a human timescale. This makes it a non-renewable energy source.

  
  

Coal is one of the most widely used fossil fuels in the world, especially for electricity generation and industrial use. However, its usage poses significant environmental challenges. Burning coal releases large amounts of carbon dioxide (CO₂), contributing to global warming and climate change. It also emits pollutants like sulfur dioxide, nitrogen oxides, and particulate matter, which cause air pollution and health issues.

In contrast, renewable sources such as wind, solar, and hydroelectric energy are clean, sustainable, and do not deplete over time. They are key solutions for meeting the world’s growing energy demand while reducing environmental damage.

Thus, the correct answer is Coal, as it is a non-renewable energy source, unlike wind, solar, and hydroelectric power.