Greenhouse gases and agricultural: an introduction to the processes and tools to quantify them Richard T. Conant
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1 Greenhouse gases and agricultural: an introduction to the processes and tools to quantify them Richard T. Conant Natural Resource Ecology Laboratory Colorado State University
2 Perturbation of Global Carbon Budget ( ) CO 2 flux (Pg C y -1 ) Sink Source extra-tropics deforestation tropics 1.5 Time (y) Le Quéré, unpublished; Canadell et al. 2007, PNAS
3 Perturbation of Global Carbon Budget ( ) CO 2 flux (Pg C y -1 ) Sink Source fossil fuel emissions deforestation Time (y) Le Quéré, unpublished; Canadell et al. 2007, PNAS
4 Perturbation of Global Carbon Budget ( ) CO 2 flux (Pg C y -1 ) Sink Source fossil fuel emissions deforestation Time (y) Le Quéré, unpublished; Canadell et al. 2007, PNAS
5 Perturbation of Global Carbon Budget ( ) CO 2 flux (Pg C y -1 ) Sink Source fossil fuel emissions deforestation atmospheric CO Time (y) Le Quéré, unpublished; Canadell et al. 2007, PNAS
6 Perturbation of Global Carbon Budget ( ) CO 2 flux (Pg C y -1 ) Sink Source fossil fuel emissions deforestation atmospheric CO ocean 2.2 Time (y) Le Quéré, unpublished; Canadell et al. 2007, PNAS
7 Perturbation of Global Carbon Budget ( ) fossil fuel emissions CO 2 flux (Pg C y -1 ) Sink Source deforestation atmospheric CO 2 land ocean 2.2 Time (y) Le Quéré, unpublished; Canadell et al. 2007, PNAS
8 Partition of Anthropogenic Carbon Emissions into Sinks [ ] 45% of all CO 2 emissions accumulated in the atmosphere 55% were removed by natural sinks Ocean removes _ 24% Land removes _ 30% Atmosphere The Airborne Fraction The fraction of the annual anthropogenic emissions that remains in the atmosphere Canadell et al. 2007, PNAS
9 Main points 1) Agriculture is a significant emitter of GHGs 2) Agriculture can play a major role in mitigation reducing total US emissions by 5-14%. 3) Action on GHG emission reduction is imminent. 4) Methods and tools already exist to quantify GHG emission reductions and soil C sequestration.
10 Main points 1) Agriculture is a significant emitter of GHGs 2) Agriculture can play a major role in mitigation reducing total US emissions by 5-14%. 3) Action on GHG emission reduction is imminent. 4) Methods and tools already exist to quantify GHG emission reductions and soil C sequestration.
11 Agricultural sources and sinks of greenhouse gases Source: IPCC 2007
12 Global GHG balances CO 2, CH 4 and N 2 O are the main gases of concern to agriculture and forestry. Global C budget (1990 s) Net land-atmosphere sink: -1.4 ± 0.3 Pg C/yr, but uncertainty high for land use emissions (0.6 to 2.5 Pg C/yr) vs terrestrial sink (-2 to -3.9 Pg C/yr) Global N 2 O budget ± 30% uncertainty in global totals for sources/sinks 75% of total emissions are from terrestrial ecosystems (ca. 50% from agriculture) Global CH 4 budget ±50% uncertainty in global totals for sources/sinks 60-70% from terrestrial ecosystems (ca. 35% from agriculture)
13 Emissions impact adjusted for radiative forcing (GWP) - global Source: Cole et al. 1996
14 Agriculture accounts for ~ 7% of total US emissions Source: Paustian et al. (2006)
15 Main points 1) Agriculture is a significant emitter of GHGs 2) Agriculture can play a major role in mitigation reducing total US emissions by 5-14%. 3) Action on GHG emission reduction is imminent. 4) Methods and tools already exist to quantify GHG emission reductions and soil C sequestration.
16 700 Annual C uptake by cropland 600 Tg C per year Harvested products Crop residues
17 Reducing N 2 O and CH 4 Emissions 20-40% reductions in emissions are achievable Nitrous oxide Improve timing of fertilizer/manure additions Avoid over-application of fertilizer/manure Better placement Use of nitrification inhibitors Methane Improved livestock breeding and nutrition Feed additives to inhibit methane (e.g. dairy) CH 4 capture from manure (biogas) Source: CAST Climate Change and Greenhouse Gas Mitigation: Challenges & Opportunities for Agriculture, 2005
18 Past Agricultural Practices Erosion Intensive tillage CO 2 Residue removal Soil organic matter Low Productivity
19 Improved Agricultural Practices Conservation buffers CO 2 Conservation tillage Cover crops Soil organic matter CRP Improved rotations
20 Potential mitigation by US agriculture Carbon dioxide Carbon sequestration 5-14% of current (2004) total emissions in the US (ca MMT C equivalent), through soil C sequestration and emission reductions from agricultural sources (primarily N2O and CH4) Source: PEW Center Report Agriculture s Role in Greenhouse Gas Mitigation, 2006
21 Main points 1) Agriculture is a significant emitter of GHGs 2) Agriculture can play a major role in mitigation reducing total US emissions by 5-14%. 3) Action on GHG emission reduction is imminent. 4) Methods and tools already exist to quantify GHG emission reductions and soil C sequestration.
22 Annual C sequestration (tonnes C) Reclamation of mineland Agricultural management Forest management Rangeland management Geological sequestration
23 Source: World Resources Institute
24 Sen. Feinstein (utility only) 731 Outreach on revenue Enhancement to Ag Producers 732 Offset Measurements for Ag, Forestry, Wetland 734 Offset Credits for Forest, Grazing, Wetland 735 Offset from Avoided Conversion of Forest and Wetland 736 Offset for GHG Emission Reduction Projects - includes eligibility for uncapped sectors (even beyond agriculture) 737 Borrowing against Future Offsets 738 Reviewing of Accounting for Offset Credits
25 Lieberman-McCain (economy-wide) Sec. 144 Alternative Measures of Compliance offsets limited to 30% of total allowances required to cover emissions in any given reporting period. If more then 15% of allowances are covered by an alternative measure of compliance, then 1.5% of total must be agricultural soil sequestration, and a report every five years after must be submitted to ensure maintenance of sequestered carbon. Traditional allowances must be relinquished to account for losses
26 Some farm bill recommendations 1) Ensure language includes greenhouse gases specifically as a resource of concern under air quality. 2) Ensure conservation programs include opportunities for reductions in all agricultural greenhouse gas emissions, including nitrous oxide and methane and enhanced carbon storage as national priorities. 3) Require that environmental tradeoffs are assessed when evaluating applications for cost-share or incentive payments. 4) Explicitly specify nitrous oxide and methane mitigation opportunities in any existing climate change language. Source: World Resources Institute
27 What s at Stake?
28 European CO2e Prices Close 12/06 /ton CO2
29 Carbon as a Crop in U.S. per Proposed GHG Limits in Lieberman-McCain Production Value ($B) 0 Carbon at $10/MT CO 2 e, dates nectarines cukes oats beans almonds lettuce fresh tomato rice oranges potatoes grapes cotton wheat CARBON hay soybeans grain corn Source: USDA - National Agricultural Statistics Service
30 Main points 1) Agriculture is a significant emitter of GHGs 2) Agriculture can play a major role in mitigation reducing total US emissions by 5-14%. 3) Action on GHG emission reduction is imminent. 4) Methods and tools already exist to quantify GHG emission reductions and soil C sequestration.
31 Accounting and Reporting Currently, US has voluntary programs for GHG reductions (1605B program) Bills pending in Congress for mandatory reductions likely action after 2008 Currently, GHG reductions being included in criteria for farm support payments Need for a user-friendly accounting method for farmers participating in 1605B and subsequent C trading activities See
32 COMET-VR (CarbOn Management and Evaluation Tool Voluntary Reporting) Currently supports soil C change estimates and fuel usage N 2 O emissions will be incorporated in the next version
33 Select state and county Select soil type and drainage condition
34 Select management sequences Select tillage management sequence
35 Output: Carbon sequestration Output: Fuel and fertilizer use
36 Main points 1) Agriculture is a significant emitter of GHGs 2) Agriculture can play a major role in mitigation reducing total US emissions by 5-14%. 3) Action on GHG emission reduction is imminent. 4) Methods and tools already exist to quantify GHG emission reductions and soil C sequestration.
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