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:

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YESPYQ · Accepted Answer

Correct answer: 1, 2 and 3. Carbon Sequestration is a process to capture and store CO2 to curb global warming. It is captured from the air, industries or power stations and stored permanently underground. Terres- trial Carbon Sequestration is the process through which CO2 from the atmosphere is absorbed by trees and plants through photosynthesis and stored as carbon in soils and biomass (tree trunks, branches, foliage, and roots). In Geologic Carbon Se- questration CO2 can be stored in oil reservoirs, gas reservoirs, unmineable coal seams, saline formations and shale formations with high organic content. Statement 1 is correct: Uneconomic coal seams can be used to store CO2 because the CO2 molecules attach to the surface of coal. Statement 2 is correct: CO2 is sometimes injected into declining oil fields to increase oil recovery. Statement 3 is correct: Other potential sites are gas reservoirs, saline formations and shale formations with high organic content. 105

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