How does water scarcity threaten the future of global food production?
Water scarcity is one of the most direct threats to global food production because agriculture depends on reliable access to freshwater at every stage of the growing process. As rainfall patterns become less predictable and aquifers are drawn down faster than they can recharge, the capacity to grow enough food for a growing world population is increasingly at risk. The sections below examine which crops and regions face the greatest exposure, how shortfalls translate into yield losses and price rises, and what approaches are helping growers produce more food with less water.
Which crops and regions are most at risk from water scarcity?
The crops most at risk from water scarcity are the world’s three principal staple grains: rice, wheat, and maize. Together these crops supply more than half of global food calories, and a significant share of their production already takes place in areas facing high or extremely high water stress. Wheat is particularly exposed, with more than 40% of global production grown in water-stressed regions, according to analysis published in 2024 by the World Resources Institute.
Geographically, the regions under the greatest pressure are the Middle East and North Africa, South Asia, and Southern Europe. The FAO’s 2025 AQUASTAT snapshot recorded renewable water availability in Northern Africa at just 565 cubic metres per person per year, a figure that leaves almost no margin for agricultural use. India, which accounts for roughly 10% of world crop production, faces critically low groundwater levels in its northwest and southern regions because of decades of excessive extraction through tube wells.
Sub-Saharan Africa faces a different but equally serious challenge: erratic and unreliable rainfall combined with limited water storage infrastructure directly threatens yields of maize, sorghum, and millet. These are not marginal crops in the region; they are the primary source of calories for hundreds of millions of people. Climate projections suggest that the probability of simultaneous crop failures across major breadbasket regions could be substantially higher by mid-century than it is today, making the geographic concentration of risk a concern for global food security as a whole.
How does water scarcity reduce crop yields?
Water scarcity reduces crop yields by disrupting the fundamental biological processes that plants depend on: photosynthesis, nutrient uptake, and reproductive development. When water is insufficient, plants close their stomata to limit moisture loss, which simultaneously restricts the intake of carbon dioxide needed for photosynthesis. The result is slower growth, smaller plants, and reduced grain or fruit set, with the severity of the loss depending on when during the growing season the shortage occurs.
The timing of water stress is critical. Shortfalls during flowering or grain filling tend to cause disproportionately large yield losses because these are the stages when the plant is most sensitive to any disruption. Prolonged stress can also accelerate senescence, causing plants to shed leaves and cease growth prematurely, well before the crop reaches maturity.
The real-world evidence for these mechanisms is visible in recent harvests. Zimbabwe’s maize crop fell by around 70% in 2024 following severe drought, while Spain’s olive harvest dropped by roughly 50% after two consecutive years of drought and record heat, according to data cited by the World Economic Forum. These are not isolated incidents but recurring patterns that reflect the underlying relationship between water availability and plant productivity. Beyond direct crop losses, drought also affects livestock: the vast majority of livestock deaths globally are attributable to drought, which compounds the pressure on food systems that depend on animal protein as well as plant-based calories.
What is the link between water scarcity and food prices?
Water scarcity drives food prices higher by reducing the volume of food available in markets while simultaneously raising the cost of producing what remains. When yields fall, supply contracts, and basic economics push prices up. The effects are not uniform: fresh fruits and vegetables, which have limited shelf lives and cannot easily be substituted, tend to experience the sharpest price spikes during drought periods.
The price consequences of recent water-related harvest failures have been significant. A prolonged drought in West Africa contributed to cocoa prices rising by close to 300% by April 2024. In Asia, rice prices in Japan rose by around 48% and vegetable prices in China surged by approximately 30% during periods of extreme heat and water stress. A Bank for International Settlements analysis found that a meaningful increase in water scarcity corresponds to a rise in consumer price index inflation of roughly 2.9 to 3.5 percentage points, alongside a measurable contraction in economic output.
The OECD’s 2025 report on the costs of drought found that the average drought episode is now at least twice as costly as it was in 2000, with costs growing at more than 3% per year. For lower-income countries and regions already experiencing food insecurity, these price increases are not merely inconvenient. Sub-Saharan Africa, where more than half the population faces food insecurity, is particularly exposed because local agricultural production is both highly dependent on rainfall and highly sensitive to any disruption in supply.
How does agriculture contribute to its own water scarcity problem?
Agriculture is both the sector most harmed by water scarcity and one of its primary causes. Estimates from the UN and FAO consistently place agriculture’s share of global freshwater withdrawals at around 70%, making it by far the dominant consumer of freshwater worldwide. A large proportion of that water is used inefficiently: in traditional flood irrigation systems, more than half the water applied to fields can be lost to evaporation or seepage before it reaches a crop’s roots.
The problem is compounded by the types of crops being grown in drying regions. The World Bank’s 2025 Global Water Monitoring Report found that more than two-thirds of inefficient irrigation in areas already experiencing reduced rainfall is linked to the cultivation of water-intensive crops such as wheat, cotton, and sugar cane. Over the past two decades, a substantial number of countries in arid and semi-arid zones have actually shifted towards more water-intensive agriculture, increasing pressure on already stressed water systems.
Groundwater depletion is a further dimension of the problem. More than 40% of global agricultural production depends on groundwater extraction, and in many regions that extraction is happening faster than aquifers can naturally recharge. The World Bank’s report estimated that the world is losing around 324 billion cubic metres of freshwater every year through a combination of worsening droughts and unsustainable land and water practices. Agricultural wastewater also re-enters rivers and groundwater in a degraded state, reducing the effective supply of usable freshwater. The structure of water pricing in most countries reinforces these patterns: because farmers rarely pay the full cost of the water they use, there is limited financial incentive to invest in more efficient approaches.
What farming methods use the least water?
The farming approaches that use the least water are those that deliver water precisely where and when plants need it, and that control the growing environment to minimise losses from evaporation and runoff. Drip irrigation, for example, can reduce water use by 30 to 50% compared to flood irrigation in vegetable crops by delivering water directly to the root zone. Controlled environment horticulture — meaning greenhouse-based production using growing media — goes further still by combining targeted irrigation with physical protection from the elements.
Greenhouse production of vegetables can yield roughly ten times more food per unit of growing area compared to open-field production, while using significantly less water and fertiliser. This efficiency advantage is particularly relevant in water-stressed regions where land and water are both constrained. In greenhouse systems, the growing medium plays a central role in water management: a well-designed substrate holds moisture consistently at the root zone, reduces the frequency of irrigation needed, and can be integrated into closed-loop systems that recapture and reuse drainage water.
At the field scale, practices that improve soil structure also improve water retention. Cover cropping, reduced tillage, and the incorporation of organic matter into soil all help the ground absorb and hold more water, reducing the volume of irrigation needed to maintain crop growth. Breeding programmes using techniques such as marker-assisted selection are also producing crop varieties with deeper root systems and lower water requirements, offering a longer-term route to reducing agriculture’s dependence on irrigation in areas where water availability is declining.
Can technology solve the water crisis in food production?
Technology cannot solve the water crisis in food production on its own, but it can substantially reduce agriculture’s water demand and improve the productivity of every litre used. The World Bank’s 2025 Global Water Monitoring Report estimated that fairly moderate improvements in water use efficiency across agriculture could reduce pressure on freshwater systems by around 137 billion cubic metres per year, which is equivalent to more than a third of all water currently used in global farming.
Smart irrigation systems that use sensors and data analysis to apply water only when and where plants require it have demonstrated water savings of 40 to 60% in controlled trials, according to a 2025 review in Frontiers in Plant Science. Greenhouse growing systems with recirculating nutrient and water solutions take efficiency further by capturing drainage and returning it to the crop, eliminating a significant source of waste. Growing media products used in professional greenhouse cultivation are an important part of this system: substrates with well-characterised water-holding properties allow growers to maintain consistent moisture at the root zone while avoiding over-irrigation. Kekkilä-BVB, for example, actively tests the water-holding capacities of its substrates and is researching circular raw materials such as cultivated plant fibres and seaweeds that could meet the water management performance criteria required in controlled environment horticulture.
The principal barrier to broader technology adoption is not a lack of proven solutions but a lack of access to them. High upfront costs, limited credit, and uncertain returns on investment mean that smallholder farmers in lower-income regions, who face some of the greatest water stress, are often the last to benefit from precision growing tools. Addressing the water crisis in food production will therefore require not only technical innovation but also the economic and policy frameworks that allow effective technologies to reach the growers who need them most.