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 :

Correct Option : D) 1, 2 and 3 All three listed options represent viable geological sites for carbon sequestration, a process critical for mitigating anthropogenic carbon dioxide emissions. Explanation: 1. Abandoned and uneconomic coal seams: - These formations possess existing geological structures suitable for CO₂ storage. - Their non-operational status allows for repurposing, potentially aiding in enhanced methane recovery from these mines. 2. Depleted oil and gas reservoirs: - These reservoirs retain porous rock structures capable of trapping injected CO₂. - Utilizing existing infrastructure minimizes the requirement for new drilling operations. 3. Subterranean deep saline formations: - These are deep rock layers saturated with saline water, situated well below potable freshwater sources. - Their geological characteristics facilitate the storage of substantial volumes of CO₂ with a low risk of leakage or freshwater contamination.

IAS 2017 — Environment & Ecology Environment & Ecology

2017mcqmedium

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 ?

Abandoned and uneconomic coal seams
Depleted oil and gas reservoirs
Subterranean deep saline formations

Select the correct answer using the code given below :

Official previous-year question

Verified 2 Aug 2026.

Options

A1 and 2 only
B3 only
C1 and 3 only
D1, 2 and 3

Did you get this right?

Solution

Correct Option :

D) 1, 2 and 3

All three listed options represent viable geological sites for carbon sequestration, a process critical for mitigating anthropogenic carbon dioxide emissions.

Explanation:

1. Abandoned and uneconomic coal seams:

These formations possess existing geological structures suitable for CO₂ storage.
Their non-operational status allows for repurposing, potentially aiding in enhanced methane recovery from these mines.

2. Depleted oil and gas reservoirs:

These reservoirs retain porous rock structures capable of trapping injected CO₂.
Utilizing existing infrastructure minimizes the requirement for new drilling operations.

3. Subterranean deep saline formations:

These are deep rock layers saturated with saline water, situated well below potable freshwater sources.
Their geological characteristics facilitate the storage of substantial volumes of CO₂ with a low risk of leakage or freshwater contamination.

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