Abstract
The relationship between livestock agriculture and climate is complex, with major differences between livestock types and production approaches; regional variation in climate, soils, alternative land use, and culture; and a good deal of uncertainty. As a result, solutions that do not take this variation into account are unlikely to have the promised effect. However, the fact that there is no one simple solution to the climate impacts of livestock has a strong silver lining, which is that everyone can take action to reduce their food and agriculture greenhouse gas emissions – their carbon hoofprint – including anyone who eats and anyone who farms. This chapter focuses on actions individual eaters and farmers can take, from vegans to meat lovers, and from concentrated animal feeding operation farmers to committed graziers.
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Notes
- 1.
- 2.
Rowntree et al. (2020).
- 3.
A quick web search reveals waste reduction tips from government agencies such as the U.S. Food and Drug Administration https://www.fda.gov/food/consumers/tips-reduce-food-waste and the U.S. Environmental Protection Agency https://www.epa.gov/recycle/reducing-wasted-food-home, as well as from nonprofit environmental and health organizations and media outlets.
- 4.
Meat from dairy herds has lower emissions than meat from beef herds because the cows are producing milk at the same time that they are bearing calves, so their manure and enteric and feed emissions are divided between the milk and meat they produce.
- 5.
U.S. Environmental Protection Agency (2020). Although beef cattle numbers are higher than dairy cow populations, their manure has much lower methane emissions because it is stored in dry packs rather than in liquid form. Liquid manure storage facilities provide an ideal environment for methanogenic microbes.
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The proportion of livestock greenhouse gas emissions that are biogenic depends on the production practices of the farm. In most cases farms with stored manure rely on fossil fuels to produce their fertilizer and power the equipment to plant and harvest feed, and so their greenhouse gas emissions include both biogenic and non-biogenic carbon. Many grass-based farms use some fossil fuel, but typically less than industrial or mixed livestock systems.
- 7.
While very small-scale manure digesters can be built relatively cheaply and have been adopted in smallholdings (Montes et al., 2013), the cost of building and managing a system that can handle the manure from even 50 cows escalates rapidly (Vance Haugen 2012, personal communication).
- 8.
Two of the Wisconsin digesters are community digesters, each serving three farms near the CAFO threshold, so the total number of CAFOs served may be slightly higher than the number of digesters. Twenty-two of the digesters constructed in Wisconsin received U.S. Department of Agriculture grants, and many digesters also received tax credits and other grant funding. (U.S. Environmental Protection Agency, 2015, n.d.-a, n.d.-b, n.d.-c)
- 9.
Oehmichen and Thrän (2017). Europe is the only region in the world where methane emissions declined in a global survey of methane sources, and it seems likely that Germany’s commitment to manure digesters was a factor in that decline. The Global Methane Budget 2000–2017 (2020), https://www.globalcarbonproject.org/methanebudget/index.htm
- 10.
In addition to cost, another advantage of manure covering and methane flaring is that it poses less risk of actually increasing total manure methane emissions. In contrast, manure digesters are designed to favor methane production, so it is critical that they be well-managed to prevent methane leaks and to use the methane they generate. (Veltman et al., 2018)
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Sala et al. (2021).
- 15.
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Even with precision farming equipment, human error or equipment malfunction can result in too much fertilizer in some places and too little in others.
- 17.
Houser et al. (2019).
- 18.
Schulte et al. (2017).
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- 20.
The additional nitrogen is needed because the soil microorganisms that decompose the dead cover crop use nitrogen, and so reduce the amount of nitrogen available to the growing cash crop (Grint et al., 2020).
- 21.
Massy (2018).
- 22.
- 23.
Maize is the primary feed crop in the U.S. and is used increasingly in European livestock production. But almost all grains consumed by humans are used in great quantities for livestock feed, including wheat, barley, oats, millet, and soybeans as well as maize or corn. From 2015 to 2020 roughly 46% of maize, 35% of sorghum, 52% of barley, and 47% of oats, rye, millet, and mixed grains grown outside the U.S. were used as animal feed. During that same period 45% of corn, sorghum, barley, and oats grown in the U.S. were fed to livestock, and most of the rest was made into ethanol (biofuel) or exported (U.S. Department of Agriculture, Economic Research Service, 2021a, b).
- 24.
For example, in Wisconsin grazing farmers mostly plant cool-season grasses and legumes from Europe. These fast-growing species usually crowd out native warm-season grasses when they are mixed together, but a mix of native warm-season grasses planted in a separate pasture can provide good forage later in the year and increase soil health. (Gene Schriefer, personal communication)
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Toensmeier (2016), Gabriel (2018). Feeding tree and shrub foliage is a common traditional practice in many parts of the world but was discouraged in North America and much of Europe for most of the past century or more with the rise of professional forest management and the intensification of livestock production. In recent years, however, rising interest in regenerative agricultural systems, including agroforestry, has prompted both farmer and researcher interest in the topic.
- 27.
- 28.
Aguirre-Villegas et al. (2017).
- 29.
Adam Abel personal communication (2018).
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U.S. Department of Agriculture Economic Research Service (2021a, b), U.S. Department of Agriculture NASS (2021).
- 31.
Noble Research Institute (n.d.), NRCS (2021a, b). One great model that has emerged in Wisconsin and some other states is for groups of farmers to support each other in doing this work. Five or more farmers in the same watershed can apply for a little bit of state funding to help them try actions that reduce water pollution and build soil health. Fortunately, almost all of these actions also reduce greenhouse gas emissions, though that was not the intent of the enabling legislation. This program has inspired farmers to try a range of sustainable practices, from reducing their use of tillage and planting cover crops to fine-tuning nitrogen applications (DATCP, n.d.).
- 32.
There are surely hundreds of environmentally and socially progressive farm groups just in the U.S., and apologies to the many not mentioned here (NSAC, n.d.).
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Mayerfeld, D. (2023). Lightening Our Carbon Hoofprint. In: Mayerfeld, D. (eds) Our Carbon Hoofprint. Food and Health. Springer, Cham. https://doi.org/10.1007/978-3-031-09023-3_8
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