Carbon sequestration

25) 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:

(a) 1 and 2 only

(b) 3 only

(c) 1 and 3 only

(d) 1, 2 and 3

Solution: (d) 1, 2 and 3

Geo-sequestration is a method that involves the capture of green house gases directly from the power stations and pumping them into underground geological formations.

Unmineable coal seams can be used to store CO2 because the CO2 molecules attach to the surface of coal.

CO2 is sometimes injected into declining oil fields thus increasing oil recovery.

Gas fields, saline formations unmineable coal seams, and saline-filled basalt formations are other potential storage sites.