Environment

Fifteen sources of greenhouse gases

Discover fifteen of the most important sources of man-made greenhouse gases which are warming the planet.


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Comments (11)

Murray Reiss: 14.10.2014, 06:40

What about emissions from the military? Either in routine operations (are these counted in aviation & transportation)? Or in war?

Editor: 02.06.2014, 11:36

Yes. Double counting is always a hazard when analysing GHG emissions sources.

Perhaps we did not adequately explain in slide 1, paragraph 2 that several of the emissions percentages in the other 14 slides (e.g. residential and commercial buildings) are subsets of the 25-30% emissions from power plants as these sources use electricity and heat from the power sector.

We felt that it would be odd to omit power plants and so included them as the biggest 'umbrella' source, then drilled down into more specific sources. We hope the new explanation clarifies this.

Editor

Bob: 01.06.2014, 00:37

Didn't anyone who was on this study have a calculator? If you put the power plants(the only one with a range) at the lowest stated level (25%), the percentages add up to 106.5%.

sambo253: 28.05.2014, 18:29

such old posts here, why is this still news online?
have we nothing better to talk about?

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!



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