This flow diagram shows global GHG emissions from different sectors including agriculture; each sector is then divided up into end use/activity which produce GHGs, in this case 'livestock and manure' which is accountable for 5.1% of total GHG emissions directly (i.e farting); not including indirect forms of emissions from deforestation, feed or indeed energy used in their transportation (this is a separate flow).
From this image it is easy to see where the largest cuts in emissions could be from energy generation, especially when considering we have alternatives to conventional (but deadly) fossil fuel combustion.
The image is from: http://www.wri.org/chart/world-greenhouse-gas-emissions-2005.
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