Oxygen and nitrogen absorb heat too and cools the planet surface Without these 2 heat absorbing gases the ground would be very hot indeed Those hot winds that heat Melbourne is summer is mainly heated oxygen and nitrogen Water vapour is the most abundant and important greenhouse gas Co2 the demonised gas is as important as oxygen Co2 is greening the planet and helping to feed the ever increasing population When was the last time earth's population was 8 billion people?
