[arcseco]

Minor note; "Manure management accounts for about 15 percent of the total greenhouse gas emissions from the Agriculture economic sector in the United States."

If you include the emissions from manure management you end with 45% of all emissions emanating from livestock production.

[nightski]

To be clear, you end up with 45% of all emissions from the agriculture sector - which would be 4.05% overall.

Also, that manure management is part of fertilization of plants if I am not mistaken.