rick_uk

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Hi Pepe C, på engelsk 
Der er noget her:
Energy Information Administration - Greenhouse Gases, Climate Change, and Energy
http://www.eia.doe.gov/oiaf/1605/ggccebro/chapter1.html
"Many gases exhibit these "greenhouse" properties...
("En drivhusgas er en luftart, som er i stand til at absorbere den infrarøde stråling (varmestråling), som udsendes fra jorden. For at kunne det, må luftartens molekyler bestå af mindst 3 atomer." http://www.drivhus.dk/Kort%20om/kortom2.html )
....Some of them occur in nature (water vapor, carbon dioxide, methane, and nitrous oxide), while others are exclusively human-made (like gases used for aerosols).... Human-made gases (2 percent of total emissions) are released as byproducts of industrial processes and through leakage.
Manchester Metropolitan University:
http://www.ace.mmu.ac.uk/eae/Global_Warming/global_warming.html http://www.ace.mmu.ac.uk/eae/Global_Warming/Older/Emissions.html http://www.ace.mmu.ac.uk/eae/Global_Warming/Older/Greenhouse_Gases.html
Greenhouse gases are present in the atmosphere naturally, released by natural sources, or formed from secondary reactions taking place in the atmosphere. They include carbon dioxide, methane, nitrous oxide and ozone... While man-made greenhouse gases include carbon dioxide, methane and nitrous oxide, some like the CFCs are completely new to the atmosphere....Chlorofluorocarbons or CFCs are wholly man-made and do not exist naturally...They are much stronger greenhouse gases than carbon dioxide and they also destroy stratospheric ozone....Unfortunately, their replacements the hydrochlorofluorocarbons or HCFCs, whilst being relatively harmless to the ozone layer, are equally potent greenhouse gases, and at present their phase-out dates are not due for another 20 to 30 years.
'Global Warming Potentials' of greenhouse gases:
http://unfccc.int/ghg_emissions_data/information_on_data_sources/global_warming_potentials/items/3825.php
Vh rick
Vi har hørt varslerne. Klokken tikker....Informerede valg.
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