scholarly journals Influence of spatially dependent, modeled soil carbon emission factors on life‐cycle greenhouse gas emissions of corn and cellulosic ethanol

GCB Bioenergy ◽  
2016 ◽  
Vol 8 (6) ◽  
pp. 1136-1149 ◽  
Author(s):  
Zhangcai Qin ◽  
Jennifer B. Dunn ◽  
Hoyoung Kwon ◽  
Steffen Mueller ◽  
Michelle M. Wander
Keyword(s):  
Life Cycle ◽  
Soil Carbon ◽  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Cellulosic Ethanol ◽  
Carbon Emission ◽  
Emission Factors ◽  
Gas Emissions

Life cycle assessment of greenhouse gas emissions from irrigated maize and their significance in the value chain

2008 ◽  
Vol 48 (3) ◽  
pp. 375 ◽  
Author(s):  
Tim Grant ◽  
Tom Beer
Keyword(s):  
Carbon Dioxide ◽  
Nitrous Oxide ◽  
Life Cycle ◽  
Soil Carbon ◽  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Gas Emissions ◽  
Soil Carbon Dioxide ◽  
Fertiliser Application ◽  
On Farm

The life cycle assessment component of this multi-institutional project determined greenhouse gas emissions in pre-farm, on-farm and post-farm activities involved in the use of maize for the manufacture of corn chips. When the emissions were expressed in terms of carbon dioxide-equivalents (CO2-e), pre-farm emissions comprised ~6% of the life cycle emissions, on-farm activities comprised ~36% and post-farm activities accounted for ~58% of life cycle greenhouse gas emissions. We used one 400 g packet of corn chips as the functional unit. The single largest source of greenhouse emissions was the emission of nitrous oxide on the farm as a result of fertiliser application (0.126 kg CO2-e per packet). The next largest was electricity used during the manufacture of the corn chips (0.086 kg CO2-e per packet). The manufacture of the packaging (box plus packet, being 0.06 kg CO2-e) was the next largest source and then the oil for frying the corn chips (0.048 kg CO2-e per packet). Greenhouse gas emissions from fertiliser application were primarily nitrous oxide (N2O), which has a global warming potential of 310 kg CO2-e/kg N2O. In typical irrigated farm systems, these emissions, when converted to CO2-e, are almost three times more than the greenhouse gas emissions that result from energy used to pump water. However, pumping irrigation water from deep bores currently produces greenhouse gas emissions that are almost three times those from irrigation using surface waters. Greenhouse gas emissions from the use of tractors on typical farms are about one-third of the emissions from pumping water. Farm management techniques can be used to increase soil carbon and reduce greenhouse gas emissions. If farms that currently burn stubble were to implement stubble incorporation then, in the absence of other changes to the supply chain, they will achieve a 30% reduction in emissions from ‘cradle to farm-gate’. In absolute terms, when the soil carbon dioxide is included (even though soil carbon dioxide in this instance is not counted as a greenhouse gas in national and international greenhouse gas inventories), our measurements indicate that carbon dioxide and greenhouse gas emissions from farms that produce maize using stubble incorporation are 56% lower than emissions from farms that burn their stubble. The pre-farm and on-farm operations add $0.40 value per kg of CO2-e greenhouse gas emitted. Post-farm processing added $2 value per kg of CO2-e greenhouse gas emitted. Processing maize for corn chips emitted more greenhouse gases than processing the same amount of corn for starch or ethanol.

scholarly journals Impacts of soil carbon sequestration on life cycle greenhouse gas emissions in Midwestern USA beef finishing systems

2018 ◽  
Vol 162 ◽  
pp. 249-258 ◽  
Author(s):  
Paige L. Stanley ◽  
Jason E. Rowntree ◽  
David K. Beede ◽  
Marcia S. DeLonge ◽  
Michael W. Hamm
Keyword(s):  
Life Cycle ◽  
Carbon Sequestration ◽  
Soil Carbon ◽  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Soil Carbon Sequestration ◽  
Gas Emissions ◽  
Midwestern Usa

scholarly journals Impact of Cycle Time and Payload of an Industrial Robot on Resource Efficiency

Robotics ◽  
2021 ◽  
Vol 10 (1) ◽  
pp. 33
Author(s):  
Florian Stuhlenmiller ◽  
Steffi Weyand ◽  
Jens Jungblut ◽  
Liselotte Schebek ◽  
Debora Clever ◽  
...  
Keyword(s):  
Life Cycle Assessment ◽  
Life Cycle ◽  
Energy Consumption ◽  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Resource Efficiency ◽  
Life Cycle Costs ◽  
Gas Emissions ◽  
Cycle Times ◽  
The Individual

Modern industry benefits from the automation capabilities and flexibility of robots. Consequently, the performance depends on the individual task, robot and trajectory, while application periods of several years lead to a significant impact of the use phase on the resource efficiency. In this work, simulation models predicting a robot’s energy consumption are extended by an estimation of the reliability, enabling the consideration of maintenance to enhance the assessment of the application’s life cycle costs. Furthermore, a life cycle assessment yields the greenhouse gas emissions for the individual application. Potential benefits of the combination of motion simulation and cost analysis are highlighted by the application to an exemplary system. For the selected application, the consumed energy has a distinct impact on greenhouse gas emissions, while acquisition costs govern life cycle costs. Low cycle times result in reduced costs per workpiece, however, for short cycle times and higher payloads, the probability of required spare parts distinctly increases for two critical robotic joints. Hence, the analysis of energy consumption and reliability, in combination with maintenance, life cycle costing and life cycle assessment, can provide additional information to improve the resource efficiency.

Reducing methane on-farm by feeding diets high in fat may not always reduce life cycle greenhouse gas emissions

2013 ◽  
Vol 19 (1) ◽  
pp. 69-78 ◽  
Author(s):  
S. Richard O. Williams ◽  
Peter D. Fisher ◽  
Tony Berrisford ◽  
Peter J. Moate ◽  
Keith Reynard
Keyword(s):  
Life Cycle ◽  
Greenhouse Gas Emissions ◽  
Greenhouse Gas ◽  
Gas Emissions ◽  
Feeding Diets ◽  
On Farm
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