Final answer:
When choosing a substitute refrigerant, Global Warming Potential (GWP) should be taken into consideration, as it directly impacts climate change by representing the refrigerant's ability to trap heat in the atmosphere.
Step-by-step explanation:
When considering a substitute refrigerant, in addition to the saturation pressure-temperature behavior, it is important to consider the Global Warming Potential (GWP). The GWP measures a refrigerant's ability to trap heat in the atmosphere relative to carbon dioxide, which has a GWP of 1. This is a significant attribute because it directly relates to the refrigerant's impact on climate change. Refrigerants with high GWP contribute more to global warming, versus those with a lower GWP, making the latter more environmentally friendly options.
Environmental concerns have made it necessary for the United Nations and other international bodies to take action, leading to treaties and agreements such as the Kyoto Protocol. This treaty requires participating countries to reduce their emission of greenhouse gases, emphasizing the importance of choosing refrigerants with lower GWP to reduce environmental impact.