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UN FAO

Its impact on ecosystems is out of proportion with the economic significance of the sector. Livestock contribute less than 2 percent of global gross domestic product (GDP) but produce 18 percent of global greenhouse gas (GHG) emissions
Livestock's long shadow

A synopsis of the report and link to the main study: Livestock in the Balance

Quotes: 
Its impact on ecosystems is out of proportion with the economic significance of the sector. Livestock contribute less than 2 percent of global gross domestic product (GDP) but produce 18 percent of global greenhouse gas (GHG) emissions