Environment

Ten sources of greenhouse gases

Discover ten of the most important sources of man-made greenhouse gases.

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Comments (7)

dev dongol: 11.04.2012, 13:20

No gases can be GHG. That is just imaginary. If there were GHGE then upper region of our climatic atmosphere would be warmer than on the surface of the EARTH. details in the blog: devbahadurdongol.blogspot.com

Eric O: 11.04.2012, 07:04

Hi,

I wish posts included year, month, date. Thank you,

Eric

acmwaugh: 06.11.2011, 15:33

I have often seen much higher figures for the production of cement. The amount of CO2 released from the chemical process of making cement is quoted as 6% and another 2-3% for the energy to produce the cement. The latest European Union/JBL report is backed up by the USGS:

CO2 emissions from the cement clinker production process, the largest of non-combustion sources of CO2, increased globally by 11%, mainly due to a 16% increase in China. Since 1990 these emissions increased from 0.5 to 1.4 billion tonnes of CO2. Including related combustion emissions, the cement industry accounts globally for about 8% of global CO2 emissions, a share that has doubled since 1990.

The figure quoted in your report is half this. Please can you explain.

Andrew Waugh

garth spooner: 18.08.2010, 02:16

With what has happened in the Gulf oil spill,why haven't we by now changed to a newer cleaner energy source e.g electric combustion.We could eat more conservatively with greater emphasis on following the diet charts of nutritionists so a short amount of the good food sources are farmed one or twice a year or vice versa with meat production at a premium.

jaumejosa: 20.02.2009, 13:07

Thanks for the quick reply :-)
I am 50% satisfied, because I'm afraid I did not phrase out the question well enough. It is clear that within the "oil and gras production" emissions, only the upstream emissions are counted, not the dowstream. BUT: in the fertilizers it 'seems' the downstream (nitrogen oxide) as well as the upstream (extraction and production of fertilizers) are counted. If this is so, the extraction of oil for the production of pesticides would be counted twice, right?
Thanks a lot for helping to understand better ;-)
Jaume

editor: 20.02.2009, 11:52

Good point: For one, you can never be 100% sure that categories selected are not overlapping. As with any statistic, a little bit of skepticism is always helpful. Oil and gas production, however, just refers to finding, extracting, transporting, and refining oil and gas. Emissions from the consumption of oil and gas products (gasoline, fertilizers etc.) don't figure under the 6.3% that we stated for oil and gas production. I hope that answers the question. Cheers!

jaumejosa: 15.02.2009, 12:23

If Oil and Gas production accounts for 6.3% of total GHG emissions being number 4, and at the same time it is claimed than fertilizers account for 6% because fertilizers and pestizides are manufactured from crude oil and natural gas .... Aren't we counting the oil and gas production twice?