The Current State of Agricultural Biodiversity and its Challenges

The world’s farms once grew thousands of crop varieties and raised hundreds of animal breeds. Today, that diversity is rapidly vanishing. According to the FAO, more than 90 percent of crop varieties have disappeared from farmers’ fields over the last century, and over half the breeds of many domestic animals have been lost. This isn’t just a conservation concern – it’s a direct threat to the stability of the global food supply. Understanding the current status of agricultural biodiversity means confronting three interconnected realities: the erosion of genetic diversity, the ecological damage caused by agricultural homogenization, and the very real consequences for food security worldwide.

Decline in genetic diversity 🔗

Agricultural biodiversity – or agrobiodiversity – refers to the variety of plants, animals, and micro-organisms used in food and farming systems. For thousands of years, farmers cultivated a wide range of locally adapted crop varieties and animal breeds, each suited to specific soils, climates, and cultural needs. That richness has been dramatically reduced in just a few generations.

The Center for Strategic and International Studies (CSIS) reports that crop varieties grown on farms have fallen by more than 90 percent over the last 100 years, and the average abundance of terrestrial native species has declined by at least 20 percent across most ecosystems since the turn of the twentieth century. Today, more than half of global caloric demand is satisfied by just three grains – rice, maize, and wheat – despite the existence of tens of thousands of edible plant species.

This process is known as genetic erosion: the replacement of diverse, locally adapted varieties with a small number of high-yield, commercially standardized ones. FoodPrint explains how the Green Revolution of the mid-twentieth century accelerated this shift significantly – modern wheat and rice varieties crowded out more diverse rotations of millets, legumes, and root crops, creating an agricultural landscape dominated by chemically dependent monocultures.

Loss of animal breeds 🔗

The decline isn’t limited to crops. The FAO’s State of the World’s Biodiversity for Food and Agriculture report notes that the proportion of livestock breeds at risk of extinction is increasing globally. The FAO’s Domestic Animal Diversity Information System currently tracks over 8,000 livestock breeds belonging to 38 species, but many of these are classified as endangered or vulnerable. Heritage breeds that once thrived in specific regional environments – carrying traits for disease resistance, heat tolerance, and local adaptation – are being replaced by a handful of high-producing commercial breeds optimized for industrial farming conditions.

The reduced integration of livestock into diverse farming systems has further severed ecological connections that once maintained soil health, nutrient cycling, and landscape diversity. In aquaculture, the development of mono-crop production systems has similarly broken down the supporting ecosystems that mixed and natural pond systems once provided.

Homogenization of agricultural systems 🔗

The shift toward genetic uniformity in crops and livestock has been accompanied by the widespread adoption of monoculture farming – the practice of growing a single crop species across large areas of land. Earth Day’s analysis highlights that in 2022, just ten crops dominated 63 percent of global farmland, supplying 83 percent of the world’s harvested food calories. This extreme consolidation prioritizes short-term efficiency over long-term ecological stability.

Soil degradation and loss of ecosystem services 🔗

Monocultures disrupt the complex biological processes that keep soils productive. When the same crop is grown repeatedly, it draws the same nutrients from the soil year after year, leading to depletion and structural degradation. Farmers compensate by applying increasing amounts of synthetic fertilizers and pesticides, which in turn pollute soil, waterways, and groundwater. Research published in Science notes that agriculture is responsible for about 90 percent of global deforestation and contributes substantially to habitat destruction, while excessive use of inorganic fertilizers and pesticides disrupts essential natural services such as pollination and soil fertility.

The cascading effects reach well beyond the field. Monoculture landscapes exhibit reduced water infiltration and increased surface runoff, meaning rainwater is less effectively absorbed into the ground. This accelerates soil erosion, reduces groundwater recharge, and carries agricultural chemicals into rivers and streams, degrading aquatic ecosystems. Healthy soils perform critical ecosystem services – nutrient cycling, carbon sequestration, water purification, and disease suppression – that monoculture farming steadily undermines.

Impact on pollinators and wildlife 🔗

Biodiversity in and around farmland is essential to agricultural productivity itself. A 2017 IPBES report estimated that insect pollination alone contributes between $235 and $577 billion per year to global food production. Yet monoculture farming severely impacts pollinators by eliminating the variety of flowering plants they depend on for food and habitat. Bees and other pollinators that feed on a single crop species suffer from compromised immune systems and poor nutritional health. The knock-on effects travel up the food chain, reducing insect, bird, and mammal diversity across agricultural landscapes.

Research following large-scale oil palm plantations in Latin America has revealed extensive declines in mammal, bird, amphibian, and pollinator diversity. The uniform crop environment creates habitat niches for pests while eliminating the natural predators that would otherwise keep them in check, forcing even greater reliance on pesticides – a self-reinforcing cycle of ecological damage.

Vulnerability to pests and disease 🔗

Genetic uniformity creates a critical vulnerability: when all plants in a field share the same genetic profile, a single pest or pathogen capable of attacking one plant can devastate an entire crop. The Gros Michel banana case is a well-documented example – in the 1950s, a soil-borne fungus called Panama Disease nearly wiped out the world’s banana industry because production was concentrated on a single variety. The Cavendish banana now faces a similar threat from Fusarium Tropical Race 4 (TR4), again due to the lack of genetic diversity within commercial banana cultivation. These are not isolated incidents – they reflect a structural fragility built into homogenized agricultural systems.

Global implications for food security 🔗

The narrowing of the agricultural genetic base has direct and serious consequences for food security at every scale – from household nutrition to global supply chains.

Nutritional consequences 🔗

As crop diversity declines, so does dietary diversity. Less than 200 plant species currently contribute to global food supplies, and the dominance of energy-rich but nutrient-poor staple crops has serious health consequences. Low dietary diversity is now a leading driver of diet-related deaths, with approximately 11 million premature deaths annually linked to unhealthy diets. The FAO estimates that the micronutrient deficiency crisis affects approximately two billion people, a figure closely linked to the erosion of traditional, nutrient-dense foods. The World Economic Forum notes that many indigenous crops – such as the flood-resistant Kattuyanam rice of Tamil Nadu or the iron-rich black rice of Manipur – are richer in essential nutrients than their industrial counterparts, yet are rapidly disappearing from farming systems.

Climate vulnerability and supply chain risk 🔗

Agricultural biodiversity is a form of risk insurance. Different crop varieties tolerate different stressors – drought, flooding, heat, specific pests – so a diverse portfolio of varieties gives farmers options to adapt when conditions shift. As CSIS emphasizes, the underperformance of a single key staple crop like rice or wheat can trigger local shortages that ripple outward into global agricultural trade disruptions and food price spikes. With climate change making extreme weather events more frequent and severe, the genetic uniformity of modern agriculture leaves food systems with dangerously little flexibility.

The 1970-1971 Southern Corn Leaf Blight in the United States is a historical warning: a fungal pathogen spread through genetically uniform corn hybrids and destroyed approximately 15 percent of the U.S. corn crop in a single season. Similar vulnerabilities exist today at far larger scales, given the global concentration of food production around a tiny number of crops and varieties.

The loss of indigenous knowledge 🔗

Agrobiodiversity loss isn’t only a biological problem – it carries a deep cultural dimension. The World Economic Forum highlights that with the disappearance of native varieties comes the loss of entire bodies of indigenous knowledge about soil management, planting seasons, health benefits, and climate adaptation – knowledge accumulated over centuries that cannot be recovered once lost. In Mexico, the birthplace of maize, native corn varieties central to indigenous culture and diet have lost significant ground to genetically modified, high-yield strains. In response, Mexico’s Congress approved a constitutional amendment in February 2025 banning the planting of genetically modified corn, reflecting a growing global recognition that agricultural sovereignty and biodiversity are inseparable.

Monitoring gaps compound the crisis 🔗

A further challenge is that the full scale of agrobiodiversity loss remains difficult to quantify. The FAO’s global biodiversity assessment acknowledges that monitoring of biodiversity for food and agriculture is uneven and often limited even in developed countries. For 61 percent of wild food species reported to nations, population trends are either not reported or simply unknown. This absence of data constrains the planning of effective conservation measures, meaning losses may be occurring faster than science is able to track.

What conservation efforts exist? 🔗

Recognition of the crisis has spurred important responses. The CGIAR global genebank network now conserves over 700,000 accessions of more than 3,000 plant species, providing a genetic reserve for breeding climate- and disease-resistant crops. The Svalbard Global Seed Vault – often called the “Doomsday Vault” – provides a safe backup of seeds from genebanks worldwide, and has already been used to help rebuild collections lost to conflict, as in the case of Syria’s national genebank during the civil war. Community seed banks in countries like Ethiopia and Kenya empower local farmers to manage and sustain crop diversity while preserving traditional agricultural knowledge. At the policy level, the United Nations has declared 2021-2030 the UN Decade on Ecosystem Restoration, and growing momentum around agroecological approaches – intercropping, agroforestry, crop diversification – is generating evidence-based pathways back toward diverse, resilient food systems.

These efforts are valuable, but conservation in gene banks is not a substitute for diversity in farmers’ fields. Living agricultural biodiversity – adapted, evolved, and managed by farming communities in their local environments – is irreplaceable once lost. The status of agricultural biodiversity today reflects decades of prioritizing short-term productivity over long-term resilience, and reversing that trend will require coordinated action across policy, research, farming practice, and consumer behavior.

What do you think? Given that just three grains supply more than half the world’s calories, how prepared do you think our food systems are for a major crop failure caused by disease or extreme weather? And should governments provide stronger incentives for farmers to grow traditional and indigenous crop varieties, even when commercial yields may be lower?

References

1. https://www.fao.org/4/y5609e/y5609e02.htm
2. https://www.csis.org/analysis/seeding-security-why-agrobiodiversity-loss-threatens-national-security
3. https://foodprint.org/issues/biodiversity-and-agriculture/
4. http://www.fao.org/interactive/state-of-biodiversity-for-food-agriculture/en/
5. https://www.earthday.org/one-crop-to-rule-them-all-the-hidden-dangers-of-monoculture-farming/
6. https://www.science.org/doi/10.1126/science.ads8197
7. https://www.savingbees.org/en/2023/03/21/why-monocultures-are-not-good-for-the-environnement/
8. https://www.weforum.org/stories/2025/05/food-future-depends-on-biodiversity/