4.12 Greenhouse Effect

4.12 Recall that water vapour, carbon dioxide, nitrous oxide, methane and CFCs are greenhouse gases.

• Uv light is short wavelength with high energy
• When it comes into the atmosphere it gets reflected of the earth's surface back into space as infra-red light 
• Green house gases such as water vapour, methane, carbon dioxide etc trap the infra-red rays 
• Once the heat is trapped the overall global temperature increases