New FAO estimates of greenhouse gas data show that emissions from agriculture, forestry and fisheries have nearly doubled over the past fifty years and could increase an additional 30 percent by 2050, without greater efforts to reduce them. This is the first time that FAO has released its own global estimates of greenhouse gas (GHG) emissions from agriculture, forestry and other land use (AFOLU), contributing to the Fifth Assessment Report of the Intergovernmental Panel on Climate Change (IPCC). Agricultural emissions from crop and livestock production grew from 4.7 billion tonnes of carbon dioxide equivalents (CO2 eq) in 2001 to over 5.3 billion tonnes in 2011, a 14 percent increase.  The increase occurred mainly in developing countries, due to an expansion of total agricultural outputs. Nearly two-thirds of greenhouse gas emissions from agriculture are sourced to the livestock sector. (fao.org)