Question raised in Rajya Sabha on Global Warming due to HFC-23, 05/12/2016. Hydrofluorocarbon – 23 (HFC-23) or Trifluoromethane, is a by-product produced during the manufacture of Hydrochlorofluorocarbon – 22 (HCFC – 22), a refrigerant gas. HFC-23 is one of the potent greenhouse gases, having Global Warming Potential of 14,800.