UPSC Prelims 2017 Question:

In the context of mitigating the impending global warming due to anthropogenic emissions of carbon dioxide, which of the following can be potential sites for carbon sequestration?

1. Abandoned and uneconomic coal seams 
2. Depleted oil and gas reservoirs 
3. Subterranean deep saline formations
   
   

Select the correct answer using the code given below:

Explanation: 

• Carbon sequestration is the process of capturing and storing atmospheric carbon dioxide. It is one method of reducing the amount of carbon dioxide in the atmosphere with the goal of reducing global climate change.
  
  
• There are primarily 3 ways for carbon sequestration, i.e biological or natural sinks, geological mechanisms and technological or artificial sinks.
  • Abandoned and uneconomic coal seams form part of artificial sinks. So, point 1 is correct.
  • Depleted oil and gas reservoirs form part of natural sinks. So, point 2 is correct.
  • Subterranean deep saline formations are part of  technological and artificial carbon sequestration mechanisms. So, point 3 is correct.
    
    

 Therefore, option (4) is the correct answer.

Subject: Environment | Sustainable Development