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Ranking the greenhouse gases in the atmosphere by name and contribution gives us the following table:

Gas /Formula /Contribution(%)

Water vapour /H2O /36 - 72%

Carbon dioxide/CO2 /9 - 26%

Methane / CH4 /4 - 9%

Ozone /O3 /3 - 7%

Of these carbon dioxide and methane have experiences significant changes in their rates of generation by human activities.

The impact of water vapour is very significant and is part of a feedback loop with global warming. As the oceans warm more water vapour is present in the atmosphere and the significance of its impact grows. In the same way the warming air releases more methane from previously contained deposits such as permafrost increasing its impact.

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