How does greenhouse gases work?
The greenhouse effect occurs when the heat reflected from the earth’s surface is prevented from escaping into space by gases in the atmosphere.The main gases ( called greenhouse gases) which are responsible for this greenhouse effect are carbon dioxide,nitrogen oxides,methane,ozone and water vapour.As concentrations of these greenhouse gases build up in the atmosphere, they re-reflect more solar heat back to earth.So, these gases not only trap the heat which is reflected from the surface but also re-reflect the heat back to the surface keeping the atmosphere near the surface always warm.
