Which one among the following gases has the highest Global Warming Potential (GWP) ?

Among the listed gases nitrous oxide has by far the highest global warming potential.

Nitrous oxide traps heat roughly three hundred times more effectively than carbon dioxide over a century.

Methane is a strong greenhouse gas but its warming potential is well below that of nitrous oxide.

Carbon dioxide is the reference gas with a global warming potential defined as one.

Sulphur dioxide is not a greenhouse gas and actually has a slight cooling effect through aerosols.

Nitrous oxide comes largely from fertilizers and also lasts long in the atmosphere.