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:

Carbon sequestration (also called carbon capture and storage) is the process of capturing waste carbon dioxide (CO2) from large point sources, such as fossil fuel power plants, transporting it to a storage site, and depositing it where it will not enter the atmosphere.

Geo-sequestration involves injecting CO2, usually in supercritical form, into underground geological formations.

• Statement 1: Abandoned and uneconomic coal seams can store CO2 because the CO2 molecules attach to the surface of coal.
• Statement 2: Depleted oil and gas reservoirs are potential sites. CO2 is sometimes injected into declining oil fields to enhance oil recovery.
• Statement 3: Subterranean deep saline formations are also potential storage sites.

Other potential sites include gas fields and saline-filled basalt formations.

After sequestration, physical (e.g., highly impermeable caprock) and geochemical trapping mechanisms prevent CO2 from escaping.

Therefore, all three statements are correct.