According to the environmental protection agency (EPA), global
warming is defined as the recent and ongoing rise in earth
surface temperature. The greenhouse gases are the most contributors
to climate pattern change.
The greenhouse gases
(GHGs) include water vapor (H2O), carbon dioxide (CO2),
methane (CH4), nitrous oxide (N2O) and fluorinated gases
including hydrofluorocarbons (HFCs), perfluorocarbons
(PFCs) and sulfur hexafluoride (SF6).
The hazard of global
warming is one of the most important and critical problems
of the world