UPSC CSE Prelims 2017 Q25 — Environment & Ecology PYQ with Answer

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

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