Greenhouse Gases (GHG)

[noun]

Greenhouse gases are gases naturally present in the athmosphere like water vapour (H2O), carbon dioxide (CO2), and ozone (O3) among others. They contribute to mantaining the Earth’s heat and they warm the Earth by absorbing energy and slowing the rate at which the energy escapes in to space. The gases act like a blanket insulating the Earth, and is called the Greenhouse effect. Without it the Earth’s temperature would be 30 degrees cooler.

e.g. CO2 is the GHG most commonly produced by human activities and it is responsible for 64% of man-made global warming.