Agriculture faces a interconnected web of challenges that threaten food security, environmental health, and the livelihoods of billions of people. Global food demand is projected to increase 35% to 56% by 2050, yet the systems we rely on to grow food are under serious strain. Here are ten of the most pressing problems.
1. Soil Degradation
Healthy soil is the foundation of all farming, and it’s disappearing. Globally, 1.6 billion hectares of land are degraded due to human activity, and over 60% of that damage occurs on cropland and pastureland. Every year, billions of tonnes of topsoil are lost to erosion alone. Salinization (salt buildup from irrigation), compaction from heavy machinery, and pollution from chemical inputs compound the problem. Topsoil takes centuries to form naturally, so once it’s gone, it’s effectively gone for good within any human timeframe.
2. Water Scarcity
Agriculture consumes roughly 70% of the world’s freshwater withdrawals, dwarfing both industrial use (about 20%) and household use (about 12%). That enormous demand collides with a shrinking supply: roughly half the world’s population already experiences severe water scarcity for at least part of the year. In major farming regions from India to the American West, aquifers are being pumped faster than rainfall can replenish them. As competition for water intensifies between cities, industry, and farms, irrigation-dependent agriculture will face increasingly difficult tradeoffs.
3. Climate Change and Crop Yields
Rising temperatures are already reshaping what grows where. A NASA study projects that global maize (corn) yields could decline by 24% by the end of the century under high-emission scenarios, with noticeable drops beginning as early as 2030. Wheat, by contrast, may see yields increase by about 17% globally, largely because warmer temperatures benefit some cooler growing regions. The picture for rice and soybeans is less clear, with models showing regional declines but disagreeing on the global net effect.
The core problem isn’t just averages. Climate change increases the frequency of extreme weather: droughts, floods, heat waves, and unseasonable frosts. A single extreme event can wipe out an entire season’s harvest in a region, and these events are becoming harder to predict and plan around.
4. Biodiversity Loss
Modern agriculture has traded genetic diversity for high yields, and the bill is coming due. Over the past century, about 75% of plant genetic diversity has been lost as farmers shifted toward genetically uniform, high-yielding crop varieties. Today, just nine plant species account for 66% of global crop production. Rice, wheat, and maize alone provide more than half the world’s plant-derived calories. Fewer than 200 species contribute to global food supplies at all.
This lack of variety creates fragility. A disease or pest that targets one of those dominant crops can spread rapidly through genetically identical fields. Meanwhile, the decline of pollinators like bees and butterflies, driven partly by pesticide use and habitat loss, threatens the roughly one-third of food crops that depend on animal pollination.
5. Food Loss and Waste
A staggering amount of food never reaches a human stomach. About 13.2% of food produced globally is lost in the supply chain after harvest but before it reaches retail, according to the FAO. Another 19% is wasted at the retail, food service, and household levels. Combined, roughly a third of all food produced is lost or wasted.
The causes differ by region. In sub-Saharan Africa, 30% to 40% of total production is lost before reaching market, largely due to a lack of proper storage, processing, and transportation. In Nigeria specifically, 45% of postharvest output spoils because cold storage is unavailable, costing the country’s 93 million small farmers about 25% of their income. In wealthier countries, the problem shifts downstream: food is thrown away by retailers for cosmetic reasons or by consumers who overbuy.
6. Greenhouse Gas Emissions
Agriculture is both a victim of climate change and a significant driver of it. Livestock are the single largest source of agricultural emissions. Methane from cattle digestion alone accounts for 20% to 26% of all agricultural greenhouse gas output. Add in emissions from manure, whether left on pastures or managed in storage systems, and livestock contribute roughly 30% to 39% of the sector’s total.
Synthetic fertilizers are another major source. When nitrogen fertilizers break down in soil, they release nitrous oxide, a greenhouse gas about 265 times more potent than carbon dioxide over a century. Fertilizer application contributes 4% to 6% of agricultural emissions. Rice paddies, land clearing, and fuel for farm machinery add further to the total.
7. Chemical Resistance
Decades of heavy herbicide and pesticide use have triggered an evolutionary arms race that farmers are losing. There are currently 541 unique cases of herbicide-resistant weeds worldwide, spanning 273 species. These weeds have evolved resistance to 21 of the 31 known ways herbicides attack plants and to 168 different herbicide products. Resistant weeds have been reported in 102 crops across 75 countries.
When a weed or pest becomes resistant to the go-to chemical, farmers often respond by applying more of it or switching to stronger alternatives, which accelerates the cycle. Chemical runoff from fields also pollutes rivers, lakes, and coastal waters, creating oxygen-depleted “dead zones” where aquatic life cannot survive.
8. Farm Size and Land Fragmentation
The world’s farms are splitting into two extremes. In industrialized regions like North America, Europe, and Oceania, farms have grown exponentially larger in recent decades, becoming capital-intensive operations that dominate global commodity markets. These large farms benefit from economies of scale but face criticism for environmental damage and contributing to rural inequality.
In contrast, regions like India and sub-Saharan Africa have seen farm sizes shrink. Global average farm size declined 15% between 1970 and 2000, then rebounded by 14% between 2000 and 2020, according to a study published in Nature Communications. The long-term trend points toward consolidation: average farm size could triple by 2100 as rural populations decline. For the hundreds of millions of smallholder farmers who currently produce a large share of the world’s food, this transition brings enormous uncertainty about their economic future.
9. Aging Workforce and Labor Shortages
Farming is physically demanding, often financially precarious, and increasingly unattractive to younger generations. In the United States, the average age of a farmer is 58.1 years, according to the 2022 Census of Agriculture. That’s nearly a decade older than the average in 1945. The share of U.S. farmers over 65 has grown from 34% to 39% between the 2017 and 2022 censuses.
The pattern is more acute in developing countries, where young people are migrating to cities in search of better-paying, less grueling work. Seasonal labor shortages have become a recurring crisis in fruit and vegetable production across Europe and North America, where harvests depend on manual picking. Mechanization can offset some of these shortages, but it requires capital investment that many farmers, particularly smaller operations, cannot afford.
10. Rising Demand Against Fixed Resources
The math of feeding the world keeps getting harder. Total global food demand is expected to increase 35% to 56% between 2010 and 2050, driven by population growth, rising incomes, and shifting diets toward more resource-intensive animal products. When climate change is factored in, that range shifts to 30% to 62%. Meanwhile, the amount of arable land per person continues to shrink as cities expand and soil degrades.
The population at risk of hunger could decline by as much as 91% under the most optimistic scenarios, or increase by up to 30% under the worst. The difference depends almost entirely on which investments and policy choices the world makes in the next two decades. Producing more food on less land with less water, fewer chemicals, and lower emissions is the central challenge of 21st-century agriculture, and none of the ten problems on this list can be solved in isolation from the others.