Final answer:
The GWPs for methane and nitrous oxide are 25 and 298, respectively, with carbon dioxide serving as the reference point with a GWP of 1. Synthetic fluorinated gases have GWPs in the thousands but are not included in the options provided.
Step-by-step explanation:
The Global Warming Potential (GWP) of various greenhouse gases quantifies their relative impact on global warming. The GWP is based on the gas's ability to absorb and scatter infrared radiation, as well as its lifetime in the atmosphere. Carbon dioxide (CO₂) is used as the reference point with a GWP of 1 due to its prevalence and is also the benchmark against which other gases are measured.
Methane (CH₄) has a GWP of 25, indicating that it is 25 times more potent than CO₂ over a 100-year period. On the other hand, Nitrous Oxide (N₂O) has an even higher GWP at 298 times that of CO₂. It's important to note that synthetic fluorinated gases are not mentioned in your options, but typically, they have a GWP in the thousands, primarily due to their very long residence time in the atmosphere.