Livestock's Long Shadow: Environmental Issues and Options is a United Nations report, released by the Food and Agriculture Organization (FAO) of the United Nations on 29 November 2006,[1] that "aims to assess the full impact of the livestock sector on environmental problems, along with potential technical and policy approaches to mitigation".

Senior author Henning Steinfeld stated that livestock are "one of the most significant contributors to today's most serious environmental problems" and that "urgent action is required to remedy the situation.

The main sources of emissions were found to be: A 2009 article in the Worldwatch Institute magazine by authors Robert Goodland and Jeff Anhang, then employed at the World Bank, claimed that the FAO report was too conservative and that livestock sector accounts for much more of global GHG emissions, at least 51%, taking into account animal respiration and photosynthetic capacity of the land used for feeding and housing livestock.

[9] In 2013 FAO publicly partnered with International Meat Secretariat and the International Dairy Federation[10] and many of the same authors of the first report published a subsequent (2013) study for the FAO, revising their estimate of anthropogenic greenhouse gas emissions due to livestock downward to 14.5%[11][12] without addressing any of the alleged errors pointed out in Goodland and Anhang's report or in the ensuing peer-reviewed debate.

[16][17] FAO cites him as a representative of the International Feed Industry Federation,[18] whose "vision is to provide a unified voice and leadership to represent and promote the global feed industry as an essential participant in the food chain that provides sustainable, safe, nutritious and affordable food for a growing world population.