Methane is, however, much more potent as a greenhouse gas than CO2, and global livestock contribute a non-negligible fraction of greenhouse gas pollution. This

Methane is, however, much more potent as a greenhouse gas than CO2, and global livestock contribute a non-negligible fraction of greenhouse gas pollution. This estimate says that livestock contribute 14.5% of all anthropogenic greenhouse gasses: http://www.fao.org/news/story/en/item/197623/icode/ http://www.fao.org/news/story/en/item/197623/icode/ As far as opportunities to curb your own carbon footprint, use one of the calculators available on the web. For many people, jet airplane travel dominates the 'discretionary' portion of GHG pollution.