5Dec19 SS Q19 Multiple Choice Questions

Option : B
Explanation :
The high global warming potential (GWP) greenhouse gases include hydro fluorocarbons (HFCs), per fluorocarbons (PFCs) and sulphur hexafluoride (SF₆). Like other GHGs, these gases trap heat in the atmosphere, but they are hundreds to thousands of times more effective at trapping heat, which leads to greater warming of the planet, compared to carbon dioxide (CO₂). The primary greenhouse gases in the atmosphere are water vapor, carbon dioxide, methane, nitrous oxide, and ozone. Water vapour accounts the largest greenhouse effect (90-85%). The CFCs, hydro fluorocarbons (HFCs), hydro chlorofluorocarbons (HCFCs), per fluorocarbons (PFCs), and sulphur hexafluoride (SF6) are referred to as high GWP gases, that is, GWP can be up to tens of thousands. For a given amount of mass, they hold substantially more heat than does CO₂.