http://www.sciencedaily.com/releases/2011/03/110304091504.htm
     According to this recent article, the export of Brazilian beef indirectly leads to deforestation in the Amazon.  This beef has been calculated as causing zero emissions from deforestation, but has been causing emissions from their digestion and feed production.  Beef from deforested areas account for only 6% of beef production, but this 6% causes about 25 times more carbon dioxide emissions then beef produced in the rest of Brazil.  Carbon dioxide emissions with deforestation are are accountable for 10% of all emissions globally.