UPSC Prelims 2017 – Question 25

Q25. In the context of mitigating the impending global warming due to anthropogenic emissions of carbon dioxide, which of the following can be the 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 codes given below.
a) 1 and 2 only
b) 3 only
c) 1 and 3 only
d) 1, 2 and 3

The correct answer is 1, 2 and 3 only. 

• Carbon sequestration 

• Carbon sequestration is the process of storing (or capturing) atmospheric carbon dioxide. 
• It is used to reduce the amount of CO2 in the atmosphere. 
• Because CO2 molecules attach to the surface of coal, abandoned and uneconomic coal seams can be used to store CO2. Hence, statement 1 is correct. 
• CO2 is also used as a recovery tool, such as injecting CO2 into depleted oil fields to boost oil recovery. Hence, statement 2 is correct. 
• Forests serve as carbon sinks because trees are natural carbon sequesters. 
• Wetland restoration, as wetlands conserve 14.5% of the world’s soil carbon; is also used for Subterranean deep saline formations. Hence, statement 3 is correct. 

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