Q. Consider the following statements regarding HFCs (HydroFluoroCarbons):
1. They are man-made and also occur naturally.
2. HFCs are powerful greenhouse gases but weak Ozone depleting substances.
Which of the above statements is/are correct?

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: B
Notes:
  • Statement 1 is incorrect 
  • Statement 2 is correct 

About HFCs 

  • HFCs are entirely man-made. They are primarily produced for use in refrigeration, air-conditioning, insulating foams and aerosol propellants, with minor uses as solvents and for fire protection. 
  • HFCs were developed to replace stratospheric ozone-depleting substances (ODS) that are currently being phased out under the Montreal Protocol on Substances that Deplete the Ozone Layer. 
  • Though HFCs do not impact the ozone layer, many HFCs are very powerful greenhouse gases and a substantial number are short-lived climate pollutants with a lifetime of between 15 and 29 years in the atmosphere. 

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