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Greenhouse Gases


My Blogs (olelog) are mainly based on my daily reading of earth science news.

Here on whatonearth.olehnielsen.dk I try to weave some of the pieces together to a greater whole with added background info.

Greenhouse gases (GHG) are gaseous components of the lower atmosphere that act like a pane of glass in a greenhouse and thereby contribute to the greenhouse effect. Some greenhouse gases occur naturally in the atmosphere, while others result from human activities. The major natural greenhouse gases are water vapor, which causes about 36-70% of the greenhouse effect on Earth (not including clouds); carbon dioxide, which causes between 9-26%; and ozone, which causes between 3-7%. Minor greenhouse gases include, but are not limited to: methane, nitrous oxide, sulfur hexafluoride, and chlorofluorocarbons (CFCs).
Very powerful greenhouse gases that are not naturally occurring include hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulfur hexafluoride (SF6), which are generated in a variety of industrial processes.

Greenhouse effect

main greenhouse gases


Water vapour - H2O

See olelog of Sunday, 13. November 2005, 08:12:39: Water vapour as greenhouse gas


Carbon dioxide - CO2

Carbon dioxide is released to the atmosphere when solid waste, fossil fuels (oil, natural gas, and coal), and wood and wood products are burned.

See olelog of

Friday, 25. November 2005, 15:46:34: Carbon Dioxide and Methane

Tuesday, 8. November 2005, 08:50:50: Carbon Dioxide Storage - 2

Tuesday, 11. October 2005, 18:02:22: Carbon Cycle – the North Sea

Wednesday, 28. September 2005, 07:55:28: Carbon Dioxide Storage

Tuesday, 27. September 2005, 09:59:46: Global Warming, Forests and Carbon Cycle


Methane - CH4

Methane is emitted during the production and transport of coal, natural gas, and oil. Methane emissions also result from the decomposition of organic wastes in municipal solid waste landfills, and the raising of livestock.

Friday, 25. November 2005, 15:46:34: Carbon Dioxide and Methane

See olelog of Saturday, 12. November 2005, 16:33:28: Methane emissions and oceans


Nitrous oxides - NOx

Nitrous oxides is emitted during agricultural and industrial activities, as well as during combustion of solid waste and fossil fuels.


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