Food Without Agriculture

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In a 2023 article published in Nature Sustainability, researchers write that food production can be more sustainable by focusing less on traditional agriculture and more on alternative methods, like chemical and biological processes.

The article highlights a specific example where dietary fats can be produced with significantly lower CO2 emissions compared to current methods used in palm oil production in Brazil or Indonesia. While acknowledging challenges like potential impacts on agricultural economies and the need for consumer acceptance, the abstract suggests that these new methods could greatly reduce the environmental impact of agriculture, especially in terms of greenhouse gas emissions, land, and water use in the next decade.

Davis, S.J., Alexander, K., Moreno-Cruz, J. et al. Food without agriculture. Nat Sustain (2023). https://doi.org/10.1038/s41893-023-01241-2

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Davis, S.J., Alexander, K., Moreno-Cruz, J. et al. Food without agriculture. Nat Sustain (2023). https://doi.org/10.1038/s41893-023-01241-2

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Abstract

Efforts to make food systems more sustainable have emphasized reducing adverse environmental impacts of agriculture. In contrast, chemical and biological processes that could produce food without agriculture have received comparatively little attention or resources. Although there is a possibility that someday a wide array of attractive foods could be produced chemosynthetically, here we show that dietary fats could be synthesized with <0.8 g CO₂-eq kcal⁻¹, which is much less than the >1.5 g CO₂-eq kcal⁻¹ now emitted to produce palm oil in Brazil or Indonesia. Although scaling up such synthesis could disrupt agricultural economies and depend on consumer acceptance, the enormous potential reductions in greenhouse gas emissions as well as in land and water use represent a realistic possibility for mitigating the environmental footprint of agriculture over the coming decade. Read original

Plain English Summary of Results

This summary was generated by Chat GPT

Proteins, fats, and carbohydrates can be made without traditional agriculture by using different carbon sources and a variety of chemical and biological methods. This article compares how much energy each process uses, with some details still uncertain. The processes vary in their continuous or batched nature. The article also discusses the challenge chemical methods face in distinguishing between molecular forms, unlike bioenzymatic methods which are more precise but limited to conditions suitable for life. The focus is on fats because they are simpler to make, have been produced at scale in the past, are a basic calorie source in many foods, and the production of oil crops like soy and palm has a huge environmental impact.

Synthesizing fats from natural gas or air-captured carbon using renewable energy could greatly reduce greenhouse gas emissions compared to traditional agriculture. Finally, the potential environmental benefits of synthetic fats are highlighted, showing that replacing a portion of soy and palm oil with synthetic alternatives could significantly reduce greenhouse gas emissions and land use, particularly in countries where these crops are intensively farmed.

Plain English Summary of Discussion Notes

This summary was generated by Chat GPT

Producing macronutrients without traditional agriculture can significantly reduce greenhouse gas emissions and land use, especially for dietary fats. Even using coal-based electricity for production can be more climate-friendly than some current agricultural methods. Beyond environmental benefits, such as reduced water use and pollution, synthetic foods can improve food security and lessen the need for labor-intensive farming jobs. This opens up possibilities for reforestation and biodiversity improvements.

However, there are challenges. The estimates are based on data that might not capture all relevant factors, and more detailed analysis is needed. The cost of synthetic foods could be higher than agricultural products, and social acceptance is a major hurdle, given the public’s skepticism about synthetic foods and potential unforeseen environmental impacts. The shift to synthetic foods could also impact the global labor force, especially smallholder farmers in the global South, as agriculture employs a significant portion of the world’s workforce.

Synthetic food production could lead to a smaller environmental footprint for agriculture, requiring much less water and can be produced anywhere with the right resources. This could make food systems more resilient but might also create new dependencies. Sustainable synthetic food production would ideally use renewable energy and atmospheric carbon.

Finally, the move towards synthesized foods prompts a reevaluation of humanity’s relationship with nature. The domestication of plants and the Haber-Bosch process for nitrogen fixation were pivotal in human history. Now, with the majority of habitable land and water used for agriculture, synthetic food offers a path to reduce the environmental burdens of agriculture and align food security with ecosystem restoration.

Read original

Davis, S.J., Alexander, K., Moreno-Cruz, J. et al. Food without agriculture. Nat Sustain (2023). https://doi.org/10.1038/s41893-023-01241-2

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