Global Livestock Environmental Assessment Model (GLEAM)

Resources - Publications and links

GLEAM Model description


The present document describes in detail the current version of the model (GLEAM 2.0) by presenting a thorough description of modules, background data, assumptions, variables and equations. GLEAM 2.0 is based on 2010 data for animal numbers and distribution, herd parameters, feed yields and rations and manure management systems. As GLEAM is in constant development, the documentation is subject to changes and updates. Please verify you are referring to the intended version. To retrieve earlier versions of the documentation, please contact us.

 [GLEAM 2.0 Documentation (July 2018)]

 [GLEAM 2.0 Supplement S1 (November 2018)]



An open version of the model: GLEAM-i

GLEAM-i brings the core functionalities of the FAO Global Livestock Environmental Assessment Model to the public in a web application. The current version of GLEAM-i allows the direct comparison between Baseline and Scenario conditions, includes feedlot systems for cattle and incorporates the 2010 background data from GLEAM. GLEAM-i is the first open, user-friendly and livestock specific tool designed to support governments, project planners, producers, industry and civil society organizations to calculate emissions using Tier 2 methods. GLEAM-i can be used in the preparation of national inventories and in ex-ante project evaluation for the assessment of technical improvements in animal husbandry, feed and manure management.

[GLEAM-i guidelines]




Tackling the climate change through livestock

Greenhouse gas emissions from ruminant supply chains

Greenhouse gas emissions from pig and chicken supply chains

Greenhouse gas emissions from the dairy sector

Additional and background publications






Five practical actions towards low-carbon livestock

Climate change and the global dairy cattle sector

Mitigation of greenhouse gas emissions in livestock production

Global livestock production systems





SOFA - Livestock in the balance

Gridded livestock of the world

Livestock's long shadow

Livestock solutions for climate change


Innovaciones en Producción cárnica con bajas emisiones de carbono: experiencias y desafíos en Amércia del Sur

Animal Health and Climate Change

Understanding the role of ruminant systems on greenhouse gas emissions and soil health in selected Central Asian countries