Correct Option: A

Gases that trap heat in the atmosphere are called green house gases. Global Warming Potentials (GWPs) are used to compare the abilities of different green house gases to trap heat in the atmosphere. Carbon dioxide is used as the base for all the calculations, so its global warming potential is 1.2. The higher the GWP, the more heat the specific gas can keep in the atmosphere. Fluorinated gases : Chlorofluorocarbons, Hydrofluorocarbons, perfluorocarbons, sulfur hexafluoride, and nitrogen trifluoride : are synthetic, powerful greenhouse gases that have highest heat trapping abilities. These gases are 1,000; 10,000 even 20,000 times more powerful than Carbon dioxide (CO₂) at trapping heat and many can stay in our atmosphere for thousands of years. Green GWPAfter GWPAfter house Gas 20 years 20 years Carbon Dioxide 1 1 Methane 72 25 Nitrous Oxide 289 298 HCFC–22 5160 1810 HFC–23 12000 14800 HFC–125 6350 3500 HFC–134a 3830 1430 HFC–143a 5890 4470 CF4 5210 7390 C2F6 8630 12200 SF6 16300 22800