Final answer:
Nitrous oxide (N2O) is an important greenhouse gas that is about 298 times more effective at absorbing infrared radiation than CO₂, contributing significantly to the greenhouse effect. The correct option is 3.
Step-by-step explanation:
In addition to carbon dioxide (CO₂) and methane (CH₄), another important greenhouse gas is nitrous oxide (N₂O). Option 3) N₂O, is correct. Nitrous oxide is approximately 298 times more effective than CO₂ at absorbing infrared radiation, contributing significantly to the greenhouse effect.
It has a high global warming potential (GWP) and is a key gas to consider when examining the impact on climate change. N₂O is largely produced by agricultural activities and some industrial processes, and it has a longer atmospheric lifetime compared to other greenhouse gases.