What is meant by 'alternative refrigerants'?

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Alternative refrigerants are replacements for substances that harm the ozone layer, chosen to keep similar cooling performance while reducing environmental impact. The best description emphasizes providing similar cooling with lower ozone depletion and/or lower global warming potential, which is the main goal in selecting substitutes. Other ideas miss the point by focusing only on cleaner combustion, suggesting worse ozone effects, or highlighting compatibility issues, which are practical drawbacks rather than defining what an alternative refrigerant is.