Relative contribution of various greenhouse gases to total global warming will not be

The correct option is N₂O – 12%.

Greenhouse gases contribute differently to global warming based on their concentration and warming potential in the atmosphere. The relative contribution of key greenhouse gases to total global warming is generally classified as follows:
1. Carbon dioxide (CO₂): Contributes approximately 60% to global warming.
2. Methane (CH₄): Contributes approximately 20% to global warming.
3. Chlorofluorocarbons (CFCs): Contribute approximately 14% to global warming.
4. Nitrous oxide (N₂O): Contributes approximately 6% to global warming.

The question asks for the contribution that will not be correct. Since the actual relative contribution of Nitrous oxide (N₂O) is about 6%, the statement "N₂O – 12%" is incorrect. Therefore, it is the correct choice for this question.