Agricultural GHG emissions estimates

May 15, 2015


"[USING IN CH2 WH10M]FAO:Crops & livestock = 5.3 billion tonnes CO2eq in 2011Net forest conversion = 2.85 billion tonnes CO2eq/yr (total is 3.8 billion tonnes; agriculture accounts for 75% of deforestation - from CGIAR - 0.75x3.8=2.85)Degraded peatlands = .15 billion tonnes CO2eq/yr (15% of the degraded peatlands related to agriculture based on "Peatlands" - original is 1 billion tonnes)Energy emission from agriculture = .785 billion tonnes CO2eq/yrTOTAL: 9.085As percent of total GHG-e: 9.085/49 billion tonnes CO2eq (total anthropogenic emissions IPCC AR5) = 0.185 x 100 = 18.5% or almost 20%[OTHER ESTIMATES]Bellarby:"The total global contribution of agriculture, considering all direct and indirect emissions, is between 8.5 –16.5 Pg CO2-eq1,2, which represents between 17 and 32% of all global human-induced GHG emissions, including land use changes (Figure 1)."CGIAR/Henry Neufeldt:19-29% entire food system14-24% agriculture (of which 30% to 50% is deforestation/land use change)14.5% livestockJonathan Foley Nature article:"Agriculture is responsible for 30–35% of global greenhouse gas emissions, largely from tropical deforestation, methane emissions from livestock and rice cultivation, and nitrous oxide emissions from fertilized soils,""Clearing tropical forests is also a major source of greenhouse gas emissions and is estimated to release around 1.1 3 1015 grams of carbon per year, or about 12% of total anthropogenic CO2 emissions."Bellarby et al., "Cool Farming: Climate impacts of agriculture and mitigation potential,", "Food Emissions," November 2014, accessed November 11, 2014, A. Foley et al., “Solutions for a cultivated planet,” Nature 478, (2011): 338, doi:10.1038/nature10452FAO, "Greenhouse Gas Emissions from Agriculture, Forestry and Other Land Use," October 4, 2014, accessed November 12, 2014,“Emissions from Forestry and Land Use,” CGIAR, accessed November 13, 2014,“Peatlands,” Climate Smart Agriculture, accessed November 13, 2014,

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