Greenhouse Gas Emission: Perception during the COVID-19 Pandemic

Table 1

The emission sources of some of the utmost GHGs.

GHGs	Means of entering the atmosphere
CO2	BFFS from natural gas, petroleum resource, and coal.; Solid waste, trees, and other biological resources.; Also, as a consequence of certain chemical reactions such as GF, the manufacture of cement.
CH4	During the production and transportation of petroleum resources and coal.; During most agricultural activities and from farm animals (livestock) and land use.; During decaying activities of organic waste.
N2O	BFFS.; During agricultural activities, industrial activities, remediation of wastewater, and land use.; From solid waste.
Fluorinated gases such as CFCs, HCFC, and halon as well as synthesized SHF, HFC, nitrogen trifluoride, and perfluorocarbons	During various industrial activities.