Carbon dioxide

main gas responsible for global warming.

sources

  • Burning fossil fuels 
  • respiration

Methane

Can trap 21 times more heat than the same amount of carbon dioxide. However, there is less methane than carbon dioxide.

Sources

  • Landfill sites
  • natural gas leaks

Nitrous oxide 

Present in the atmosphere in tiny amounts but can trap 270 times more heat than the same amount of carbon dioxide.

sources 

  • Burning of fossil fuels
  • fertilisers