Vertical Farming vs. Agroforestry: Two Paths to Sustainable Food Production
By Dirk Röthig | CEO, VERDANTIS Impact Capital | March 8, 2026
Billions flowed into high-rise farms that were supposed to feed cities. Then came the bankruptcies. On the other side stands a system that has delivered food and climate protection simultaneously for millennia. A direct comparison of two paradigms — and the question of which can sustain a world with growing population and shrinking resources.
Tags: Vertical Farming, Agroforestry, Sustainable Food Production, CO2 Sequestration
The Promises of the Technological Path
In 2021, the future of agriculture seemed crystal clear: towers filled with LED-lit shelves, hydroponically irrigated salads, and algorithmically controlled growth chambers. Venture capital flowed in billions to companies that promised to produce food directly in cities — controlled, pesticide-free, weather-independent. AeroFarms, Bowery Farming, AppHarvest, Infarm: The names sounded like revolution.
Four years later, the balance sheet is sobering. AeroFarms filed for insolvency in 2023 and had to restructure under Chapter 11 proceedings (Food Institute, 2023). AppHarvest, once valued at $1.4 billion, liquidated in July 2023 under $341 million in debt (Vertical Farm Daily, 2023). Infarm, the European flagship startup backed by over $600 million in venture capital, laid off more than half its workforce (Fast Company, 2023). Bowery Farming, financed with $700 million, ceased operations in late 2024 (iGrow Marketplace, 2024).
What happened? And what does this mean for the comparison with the oldest cultivation system in human history — agroforestry?
The Energy Dilemma of Vertical Farming
The fundamental problem with vertical farming is physical in nature: plants need light. In closed buildings without sunlight, this must be produced artificially — and that comes at a price.
Studies show that vertical farming requires approximately 10 kilowatt-hours of electricity to produce one kilogram of food. Conventional agriculture averages 0.3 kilowatt-hours per kilogram (BIORAMA / Heinrich Böll Foundation, 2024). Research on hydroponic lettuce cultivation in Arizona found a factor of 82 compared to open-field farming. Rabobank experts estimate that electricity costs account for an average of a quarter of all operating costs for a vertical farm (Rabobank, 2023).
The CO2 balance depends directly on this. As long as electricity comes from fossil sources, vertical farming produces approximately sixteen times more CO2 per kilogram of harvest than open-field farming, according to calculations by the Heinrich Böll Foundation (Heinrich Böll Foundation, 2024). This fundamentally contradicts the sustainability claim of this technology.
Some advantages remain real: vertical farms require 70 to 95 percent less water than conventional agriculture (Columbia University, 2023). Land consumption per unit of harvest drops by over 90 percent. Pesticides are barely needed. And for certain premium niches — herbs, microgreens, high-price salads in dense cities — the model can be economically viable. But as an answer to the global food security question or climate change, it barely qualifies.
Agroforestry: Millennia of Practice, Modern Science
While the vertical farming industry struggled with misallocated investments and energy costs, agroforestry has experienced a scientifically grounded boom in recent years. The principle is the oldest in the world: trees, shrubs, and crops are combined on the same land — the way European farmers practiced it for centuries in fruit-tree meadows, hedgerow landscapes, and silviarable systems.
Modern research now quantifies what generations intuitively knew. A systematic meta-analysis of 109 peer-reviewed studies from 2000 to 2024 shows that agroforestry systems sequester between 3.5 and 9.8 megagrams of CO2 per hectare per year globally — that corresponds to 3.5 to 9.8 tons of CO2 (GJESM, 2024; Springer Nature, 2025). Particularly high-performance systems with fast-growing tree species achieve significantly higher values.
Agroforestry is not a retreat into pre-industrial times. It is the integration of biodiversity, climate protection, and food production in a single system — and thus structurally exactly what vertical farming attempts to simulate with enormous technical effort.
Direct Comparison: Five Decisive Dimensions
1. CO2 Balance
Vertical farming generates (on grid electricity) significant CO2 emissions. Only with 100 percent renewable energy does the balance become positive — which further increases operating costs. Agroforestry systems, by definition, are CO2 sinks: they bind carbon in trees, soils, and humus without requiring significant external energy. Winner: Agroforestry.
2. Energy Consumption
Vertical Farming: 10–18 kWh per kilogram of harvest. Agroforestry: virtually no external energy input required, as natural sunlight and rainwater are used. Winner: Agroforestry.
3. Water Consumption
Vertical farming achieves its strongest advantage here: up to 95 percent water savings compared to open-field farming. Agroforestry systems also improve water retention in soil through deep-reaching tree roots and reduce evapotranspiration, but are geographically dependent on natural precipitation. In water-scarce regions: Point to vertical farming.
4. Product Diversity and Food Security
Vertical farming is suited for leafy vegetables, herbs, and small-fruited plants — structurally inherent, as wheat, potatoes, legumes, or tree fruit are uneconomical. Agroforestry systems produce the full spectrum: fruit, nuts, grains, vegetables, meat (silvopastoral), timber, and ecosystem services. For global food security: Agroforestry.
5. Scalability and Capital Requirements
Establishing a vertical farm requires million-dollar investments in infrastructure, lighting, climate control, and automation — with short amortization periods that conflict with agricultural timeframes. Agroforestry can be started with considerably lower capital, works with existing land, and scales gradually. For broad implementation: Agroforestry.
Paulownia: The High-Performance Tree in Agroforestry Systems
Within agroforestry, one tree species stands out with exceptional values: Paulownia. Hybrid varieties bind, based on estimates from long-term experiments at the University of Bonn (Prof. Dr. Ralf Pude, Campus Klein-Altendorf), up to 22 tons of CO2 per hectare per year — a value that few other European-plantable tree species achieve. Under optimal conditions, values of up to 36 tons of CO2 per hectare per year are cited (TROX SE / VERDANTIS, 2024).
This figure alone makes Paulownia in the agroforestry system a game-changer for carbon credits and corporate CO2-neutralization strategies.
However, a common misunderstanding concerns invasiveness. Public discussion does not always differentiate between wild forms and sterilized hybrids. At VERDANTIS Impact Capital, exclusively sterilized Paulownia hybrid plants are used, which do not produce fertile seeds. In German open-field trials — documented by paulownia-baumschule.de, among others — the germination rate was zero percent. Uncontrolled spread is thus factually excluded.
These hybrids tolerate temperatures of -20 to -25°C and are winter-hardy for Central European sites. While they are on the "Gray List" of the German Federal Agency for Nature Conservation (BfN) — this classification refers to wild forms with fertile seeds, not sterilized hybrids. Given the documented CO2-binding performance, zero germination rate, and enormous potential for climate protection and bioeconomy, sterilized Paulownia hybrids should be placed on the EU Green List — as a recommended species for sustainable land use and agroforestry systems. As long as this classification is lacking, a scientifically proven climate protection tool remains politically underutilized.
VERDANTIS Impact Capital: Agroforestry as Investment Strategy
Dirk Röthig and the team at VERDANTIS Impact Capital recognized early what the comparative figures show: the most scalable, cost-effective, and simultaneously effective solution for corporate CO2-neutralization lies not in the technology hall, but on the land.
VERDANTIS operates Paulownia-based agroforestry systems structured as direct impact investments. For companies that want to become CO2-neutral, this approach offers decisive advantages over pure technology investments: the CO2 sink is created permanently, is measurable and certifiable, and the underlying land use simultaneously creates biodiversity, soil protection, and long-term economic value.
Where vertical farming burns capital and remains dependent on permanent energy supply, agroforestry works with natural processes — and delivers tradable carbon credits that are increasingly in demand on the growing voluntary CO2 market.
VERDANTIS thus demonstrates: the most economical path to CO2-neutrality does not run through the server room, but through the forest — or more precisely: through the agroforestry system with the right tree species in the right locations.
Conclusion: Not Either-Or, But Clear Weight
It would be wrong to condemn vertical farming outright. For dense urban areas, climatically extreme regions, or the cultivation of premium products in minimal space, the technology can have its place. Particularly with regenerative electricity, its CO2 balance improves significantly. The convergence of CEA (Controlled Environment Agriculture) with AI-driven optimization could further reduce energy consumption in coming years (ScienceDirect, 2024).
But as a foundation for feeding eight to ten billion people — and as a climate protection instrument — agroforestry is structurally superior: more cost-effective, CO2-positive, biodiversity-promoting, scalable globally without mega-investments in infrastructure.
The insolvencies in the vertical farming sector are no accident. They are the signal of a market that separates technological hype from ecological-economic substance. Agroforestry — combined with modern tree species such as Paulownia hybrids, digital monitoring, and professional carbon credit management — offers this substance.
The question is not whether technology or nature. The question is which foundation is robust enough for the transformation facing global agriculture. The answer that the numbers provide is clear.
More Articles by Dirk Röthig
- Agroforestry in Europe: Trees Improve Yields and Climate — How agroforestry systems improve yields and CO2 balance
- Precision Agriculture 2026: How Satellites Control the Harvest — Satellite data and digitalization in agriculture
- Humus as Climate Protection: The Underestimated CO2 Store — Regenerative agriculture and soil carbon
Sources
BIORAMA / Heinrich Böll Foundation (2024): Vertical Farming: Revolution or Illusion? Heinrich Böll Foundation. Available at: https://www.boell.de/de/2024/01/09/vertical-farming-revolution-oder-illusion
Columbia University (2023): Vertical Farming: Resource Efficiency and Environmental Impact. Earth Institute, Columbia University.
Fast Company (2023): The vertical farming bubble is finally popping. Available at: https://www.fastcompany.com/90824702/vertical-farming-failing-profitable-appharvest-aerofarms-bowery
Food Institute (2023): What Does AeroFarms' Bankruptcy Signal for CEA's Future? Available at: https://foodinstitute.com/focus/what-does-aerofarms-bankruptcy-signal-for-ceas-future/
GJESM — Global Journal of Environmental Science and Management (2024): The role of carbon sequestration and biodiversity in agroforestry for climate change mitigation. Available at: https://www.gjesm.net/article_731134.html
iGrow Marketplace (2024): Lessons Learned Overview: Plenty's Bankruptcy and Implications for Vertical Farming. Available at: https://www.igrowmarketplace.com/post/lessons-learned-overview-plenty-s-bankruptcy-and-implications-for-vertical-farming
Pude, R. (2022): Paulownia Hybrids in European Agroforestry Systems — Winter Hardiness, Growth, and CO2 Performance. University of Bonn, Campus Klein-Altendorf.
Rabobank (2023): Indoor Farming: Economics and Energy. Rabobank Food & Agri Research.
ScienceDirect (2024): Benchmarking energy efficiency in vertical farming: Status and prospects. Available at: https://www.sciencedirect.com/science/article/pii/S2451904924007832
Springer Nature (2025): A Systematic Review on the Role of Agroforestry Practices in Climate Change Mitigation. Climate Resilience and Sustainability. DOI: 10.1002/cli2.70018
TROX SE / VERDANTIS Impact Capital (2024): Paulownia — the CO2 Storage Tree. Available at: https://paulownia.trox.de
Vertical Farm Daily (2023): Lessons from vertical farming bankruptcies, layoffs, and closures in 2023. Available at: https://www.verticalfarmdaily.com/article/9537965
About the Author: Dirk Röthig is CEO of VERDANTIS Impact Capital based in Zug, Switzerland — an impact investment platform for carbon credits, agroforestry, and nature-based solutions. He advises companies on developing cost-effective CO2-neutralization strategies based on certified agroforestry projects. Contact and further articles: verdantiscapital.com | LinkedIn
Über den Autor: Dirk Röthig ist CEO von VERDANTIS Impact Capital, einer Impact-Investment-Plattform für Carbon Credits, Agroforstry und Nature-Based Solutions mit Sitz in Zug, Schweiz. Er beschäftigt sich intensiv mit KI im Wirtschaftsleben, nachhaltiger Landwirtschaft und demographischen Herausforderungen.
Kontakt und weitere Artikel: verdantiscapital.com | LinkedIn
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