Final answer:
Ammonia is the refrigerant listed that will not contribute to global warming because unlike HCFCs and HFCs, it does not contain elements that have significant warming effects on the planet.
Step-by-step explanation:
Refrigerants and Global Warming
Among the listed refrigerants, ammonia (NH3) is the type that will not contribute to global warming. Refrigerants like R-22, R-134a, and R-410A are classified as either hydrochlorofluorocarbons (HCFCs) or hydrofluorocarbons (HFCs), and they have been identified as greenhouse gases that can have a significant warming effect on the planet. Ammonia, however, does not have a greenhouse effect because it does not contain chlorine or fluorine, which are elements found in many synthetic refrigerants that contribute to both ozone depletion and global warming. As a natural refrigerant with zero global warming potential (GWP), ammonia is considered more environmentally friendly for use in refrigeration systems.
In the context of other greenhouse gases, substances like carbon tetrachloride (CTC), methyl chloroform, and different types of HCFCs (e.g., HCFC-22, HCFC-123, HCFC-124) have been known to contribute to both ozone layer depletion and global warming. These substances are being phased out in favor of more sustainable options. Note that it is important to handle ammonia with care as it is toxic and flammable in high concentrations.