What type of refrigerant is known for being environmentally friendly and non-ozone depleting?

HFCs, or hydrofluorocarbons, are recognized for being environmentally friendly and non-ozone depleting. They were introduced to replace substances that harm the ozone layer, such as CFCs (chlorofluorocarbons) and HCFCs (hydrochlorofluorocarbons). While HFCs do not contribute to ozone depletion, it is important to note that they can still have global warming potential, leading to discussions about their regulation and the development of even more sustainable alternatives.

CFCs are known to be harmful to the ozone layer, as they release chlorine atoms when exposed to ultraviolet light in the atmosphere. HCFCs, while less damaging than CFCs, still pose a risk for ozone depletion and are being phased out. Ammonia is a natural refrigerant and is known for having a lower environmental impact compared to synthetic refrigerants, but it is not classified as non-ozone depleting in the same context as HFCs.

The choice of HFCs aligns with modern refrigerant standards aimed at reducing environmental impact, making it the correct answer in this context.