Answer: pollution.
- A pollution
- B conservation
- C recycling
- D afforestation
Correct answer: A. pollution
Explanation: Pollution is the contamination of the environment by harmful substances.
Sunlight passes through the atmosphere and warms the surface; the surface re-radiates this energy as infrared heat, which greenhouse gases (CO₂, CH₄, water vapour) absorb and trap - a naturally beneficial process that intensifies into global warming as gas concentrations rise from human activity.
Concept context
Pollution, global warming, ozone depletion, deforestation, and sustainability. Important for NEET and general awareness.