Global farm animal production and global warming

"Though much evidence of its negative impacts on environmental integrity, community sustainability, public health, and animal welfare has been amassed, the totality of the animal agriculture sector’s global impacts has remained largely underestimated and underappreciated. A review of the relevant data calculated the sector’s contributions to global greenhouse gas (GHG) emissions and determined them to be so significant that, measured in carbon dioxide equivalent, the animal agriculture sector’s emissions surpass those of the transportation sector", in Environmental Health Perspectives, Jan 2008.