Q. 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 code given below:

• 1 and 2 only
• 3 only
• 1 and 3 only
• 1, 2 and 3

Answer: (d) 1, 2 and 3

Notes:

Carbon sequestration

• The process of storing (or capturing) atmospheric carbon dioxide is called Carbon sequestration.
• It is used for reducing the amount of carbon dioxide in the atmosphere.
• Its uses/methods:
  • Abandoned and uneconomic coal seams can be used to store CO₂  as the CO₂ molecules attach to the surface of coal.
  • CO₂ is also used as the recovery tool as by injecting CO₂ into declining oil fields to increase oil recovery.
  • Forests as sink as trees are natural sequesters of carbon.
  • Wetland restoration as wetlands conserves 14.5 % of the soil carbon found in the world.
  • Also used for Subterranean deep saline formations.