Regan Brown
Agriculture is heavily reliant on fossil fuels, which are used at every stage of the food supply chain, from the farm to the point of purchase by the consumer. Fossil fuels are used directly for tillage, crop management, and the application of energy-intensive inputs such as nitrogen fertilizer and pesticides. They are also used to power the tractors and other infrastructure necessary to support agriculture and food supplies. The price of fossil fuels directly affects the costs of tillage and fertilizers and influences the prices of food seen by the end consumer. As the world transitions to cleaner energy sources, the challenge is to optimize energy inputs in agriculture and reduce greenhouse gas emissions while meeting the growing global demand for food.
| Characteristics | Values |
|---|---|
| Dependence on fossil fuels | Agriculture is becoming more dependent on fossil fuels for tillage, crop management, nitrogen fertilizer, pesticides, and infrastructure |
| GHG emissions | Agriculture accounts for a significant portion of anthropogenic GHG emissions, with disproportionate contributions to methane and nitrous oxide production |
| Land use | Agriculture occupies over 50% of the world's vegetated land, with land use changes (LUC) for cattle ranching and livestock feed contributing further GHG emissions |
| Fossil fuel prices | Fossil energy prices directly impact tillage and fertilizer costs and influence almost all aspects of agricultural production, including food prices for consumers |
| Food security | Cheap and versatile fossil fuels have subsidized food and resource security, but there is a growing need to reduce dependence and transition to renewables |
| Energy intensity | Fossil fuel intensities in the agricultural supply chain are calculated by organizations like the Global Footprint Network using EF-MRIO assessments |
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What You'll Learn
Fossil fuel combustion for heat and energy
The combustion of fossil fuels, such as gas/diesel oil, motor gasoline, liquefied petroleum gas (LPG), natural gas, fuel oil, and coal, releases carbon dioxide (CO2) and non-CO2 emissions. In 2019, annual emissions from energy use in agriculture were estimated at 523 million tonnes of CO2 equivalents (Mt CO2eq yr-1), excluding electricity. When electricity consumption was included, emissions rose to 1029 Mt CO2eq yr-1, representing a 7% increase from 1990 levels.
The price and availability of fossil fuels, such as oil, natural gas, and coal, directly influence the costs of tillage, fertilizers, and other agricultural inputs. Changes in fossil fuel prices can impact production costs and influence the adoption of alternative energy sources or practices to mitigate energy price risks.
To reduce GHG emissions and optimize energy inputs, the agriculture industry is exploring alternatives to fossil fuel combustion for heat and energy. This includes the co-production of woody biomass for heat and power generation alongside commodity crops, as well as the integration of forestry and woody biomass cultivation on farms. These practices can help balance GHG-intensive activities and provide economic benefits through the sale of biomass fuel products or the acquisition of carbon credits.
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Fossil fuels in tractors and buildings
Fossil fuels are heavily used in tractors and buildings in the agricultural sector. Red diesel fuel, a common agricultural fuel, powers tractors, combines, harvesters, and other heavy equipment. It offers high energy density, making it ideal for long operating hours and demanding tasks such as ploughing, planting, harvesting, and transportation. Additionally, gasoline is used in smaller agricultural equipment like lawnmowers, chainsaws, and portable generators.
The use of fossil fuels in tractors and agricultural machinery contributes significantly to greenhouse gas emissions. As a result, there is a growing shift towards alternative fuels like biodiesel, which offers environmental benefits and reduced dependence on fossil fuels. Electric tractors and electric vehicles for on-farm transportation are also gaining popularity as farmers seek cleaner and more sustainable energy options.
In agricultural buildings, propane (liquefied petroleum gas) is commonly used for heating greenhouses and livestock buildings. Natural gas is another important fuel source in agricultural operations, used for powering stationary engines for electricity generation and as a heat source for drying crops. The use of fossil fuels for heating and electricity generation in agricultural buildings contributes to indirect emissions from electricity end-use, which can be substantial.
The agricultural sector's demand for fossil fuels for tractors and buildings is influenced by various factors, including equipment specifications, availability, cost, and environmental considerations. As agricultural producers invest in infrastructure to increase yields and competitiveness, the embodied energy in tractors and buildings is likely to continue growing. However, the mix of fuels used can vary depending on the specific needs and preferences of farmers.
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Tillage, crop management, and fertiliser
Modern agriculture is heavily dependent on fossil fuels for direct energy use in crop management and indirect energy use in fertilizers, pesticides, and machinery production. Fossil energy prices directly affect the costs of tillage and fertilizers and almost all other aspects of agricultural production. Tillage, crop management, and fertilizer use are critical components of agriculture that have been influenced by the use of fossil fuels.
Tillage is the preparation of soil for planting, and it is typically done with tractors or other machinery that use diesel fuel. Fossil fuels, particularly diesel, are used to power the machinery needed for tillage, such as ploughs and cultivators. The increasing oil prices will directly impact the cost of diesel used for tillage, affecting the preparation of the soil for planting.
Crop management involves the care and maintenance of crops throughout their growth cycle. Fossil fuels are used in crop management in various ways. For example, fossil fuels are used to power tractors and other machinery used for tasks such as planting, irrigation, and harvesting. Additionally, fossil fuels are used to produce pesticides and other chemicals that are applied to crops to protect them from pests and diseases.
The production of nitrogen-based fertilizers is a significant area where fossil fuels are heavily used in agriculture. Nitrogen fertilizers use large amounts of natural gas and some coal in their manufacturing process. The relative changes in fossil fuel prices will differentially affect each crop type. For instance, increasing natural gas prices will immediately impact nitrogen fertilizer prices, as natural gas is a significant component in their production.
The use of fossil fuels in agriculture has contributed to major increases in food production since the 1960s. However, the relationship between energy inputs and yields is not linear. While low-energy inputs can lead to lower yields, increasing energy inputs may result in smaller yield gains. As agricultural yields and the inputs needed to support them increase, the sector becomes more dependent on fossil fuels.
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Pesticides and nitrogen fertiliser
The production of synthetic pesticides and nitrogen-based fertilizers relies heavily on fossil fuels, particularly coal, oil, and natural gas. The energy-intensive nature of their production has raised concerns about greenhouse gas emissions and environmental sustainability.
Nitrogen fertilizers, in particular, have a significant environmental impact. The production process involves capturing and processing atmospheric nitrogen, which requires substantial fossil fuel inputs. Additionally, complex soil-based processes associated with nitrogen fertilizers result in the production and release of nitrous oxide, a potent greenhouse gas.
The use of synthetic fertilizers has led to overapplication, with farmers applying more fertilizers than crops can utilize. This excess fertilizer pollutes the air, water, and climate, contributing to climate change and biodiversity loss. The dirty, fossil fuel-based manufacture of fertilizers also disproportionately impacts marginalized communities, particularly Black and Brown communities, where these facilities are often located.
The dependence on fossil fuels in pesticide and fertilizer production has resulted in industrial food production's vulnerability to volatile oil and gas markets. This interdependence has been highlighted by market shocks in food, fuel, and fertilizer prices.
To address these concerns, there is a growing need for alternative farming practices and sustainable agricultural technologies. Transforming food systems away from fossil-fuelled industrial agriculture towards climate-resilient agroecological approaches is essential for advancing climate justice and food sovereignty.
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Livestock feed and cattle ranching
Fossil fuels are extensively used in agriculture, and livestock feed and cattle ranching are no exceptions. The use of fossil fuels in these areas is multifaceted and often indirect, contributing to various stages of the livestock supply chain. Here is a detailed overview:
Livestock Feed
The production of livestock feed, such as cereals and grains, relies on fossil fuels in multiple ways. Firstly, fossil fuels are used to power the machinery and equipment used in the cultivation and harvesting of feed crops. This includes tractors, combine harvesters, and irrigation systems. Fossil fuels are also used in the production and application of fertilizers and pesticides, which are essential for optimizing feed crop yields. The manufacturing and transportation of these agrochemicals depend on fossil fuels, contributing to the overall carbon footprint of livestock feed production.
Additionally, fossil fuels are implicated in the processing and distribution of livestock feed. Once the crops are harvested, they often undergo processing to enhance their nutritional value or extend their shelf life. This processing requires energy, and in many cases, fossil fuels are burned to generate the required heat or electricity. Furthermore, the transportation of feed from production sites to farms or distribution centers relies on fossil fuels, particularly diesel, for long-haul trucks and other vehicles.
Cattle Ranching
Cattle ranching, or livestock farming, also has direct and indirect connections to fossil fuel usage. On cattle ranches, fossil fuels are used for various activities, including herding, transportation of cattle, and operating machinery for fencing, water pumping, and other infrastructure needs. Additionally, in some cases, fossil fuels may be used for heating or cooling cattle sheds or barns during extreme weather conditions.
The indirect use of fossil fuels in cattle ranching is also significant. For example, fertilizers and pesticides applied to grazing lands to enhance forage quality and quantity often have ties to the fossil fuel industry. The production and application of these agrochemicals contribute to fossil fuel consumption. Moreover, the global demand for meat and dairy products is expected to increase, which will further intensify the use of fossil fuels in cattle ranching as production scales up.
In conclusion, livestock feed and cattle ranching are integral components of the livestock supply chain, and they are closely intertwined with fossil fuel usage. While some uses of fossil fuels in these areas may be challenging to eliminate, there is a growing emphasis on adopting more sustainable practices, such as agroecology and regenerative approaches, to reduce the sector's environmental footprint and dependence on fossil fuels.
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Frequently asked questions
Fossil fuels are used in agriculture for tillage, crop management, and the application of energy-intensive inputs like nitrogen fertilizer and pesticides.
Fossil fuel prices directly impact the costs of tillage and fertilizers and indirectly affect almost all aspects of agricultural production, including the prices of food for the end consumer.
Agriculture accounts for around 20% of anthropogenic greenhouse gas (GHG) emissions, with fossil fuel combustion for heat and energy being a major contributor. It also contributes significantly to methane and nitrous oxide production.
Moving away from fossil fuels in agriculture involves adopting renewable energy sources, electrifying transport, and transforming our food systems. This includes reducing energy inputs, improving yields, and exploring alternatives to energy-intensive practices.
The challenges include optimizing energy inputs, reducing GHG emissions, meeting the growing global demand for food, and addressing the impact of agriculture on soil degradation, water quality, and biodiversity. Additionally, the availability and price of fossil fuels can influence the adoption of alternative practices.
