Scarcity shapes nearly every part of modern life, from the water you drink to the medical equipment that diagnoses disease. Some scarce resources are running out because we’re consuming them faster than nature can replace them. Others were never abundant to begin with. Here’s a look at the most consequential things in short supply around the world.
Fresh Water
Only about 3% of Earth’s water is fresh, and most of that is locked in glaciers and ice caps. The usable supply is under mounting pressure from agriculture, industry, and growing populations. In 2020, 2.4 billion people lived in water-stressed countries, and nearly 800 million of those lived in areas with high or critically high water stress. While the global average water stress level sits at a seemingly safe 18.2%, that number hides enormous regional variation. Parts of the Middle East, North Africa, and Central Asia are already drawing down water faster than rainfall and rivers can replenish it.
River Sand
Sand might seem like one of the last things that could run short, but the type used in construction is genuinely scarce. Concrete and asphalt require angular, rough-grained sand found in riverbeds, lakes, and ocean floors. Desert sand, despite its abundance, is too smooth and round to bind properly. We’ve been extracting river sand faster than nature can replace it for decades, destroying aquatic habitats and polluting waterways in the process.
The demand is so intense that criminal organizations, sometimes called “sand mafias,” mine it illegally and have threatened or attacked people who try to stop them. Policymakers in parts of Asia and Africa have struggled to enforce bans on sand mining, making this one of the more surprising and dangerous scarcity problems on Earth.
Helium
Helium is the second most common element in the universe, but on Earth it’s a finite resource found only in trace quantities within certain natural gas fields, primarily in the United States, Qatar, and Algeria. Extracting and purifying it is complex and expensive. Since 2006, global helium supplies have run critically low four separate times.
The shortage matters most for medicine. MRI scanners rely on roughly 2,000 liters of liquid helium to cool their superconducting magnets to about -270°C. Without a steady helium supply, hospitals face rising costs and the real possibility of scanners going offline. The 2022 shortage put radiologists and clinicians worldwide on high alert, and newer “helium-free” MRI designs are being developed partly in response to this ongoing vulnerability.
Phosphorus
Every food crop on the planet depends on phosphorus. It’s a key ingredient in fertilizer, and there is no substitute. The world’s supply comes almost entirely from mined rock phosphate, with major reserves concentrated in Morocco, China, and a handful of other countries. Estimates for when global phosphorus production will peak range from as early as 2033 to later in this century, depending on how reserves are calculated. One widely cited estimate puts remaining reserves at around 18,000 million tonnes, with a production maximum likely before 2100 even under the most generous projections.
Once phosphorus production peaks, fertilizer prices will climb, putting pressure on food systems everywhere. Unlike oil, there’s no alternative energy source waiting in the wings. Phosphorus recycling from wastewater and agricultural runoff is possible but still far from widespread.
Lithium
The global push toward electric vehicles and battery storage has made lithium one of the most strategically important minerals on Earth. The International Energy Agency projects that total lithium demand could reach 531,000 tonnes by 2030 under climate-aligned scenarios, with clean energy technologies alone accounting for about 442,000 tonnes of that. Mining and refining capacity is concentrated in just a few countries, primarily Australia, Chile, and China, creating supply chain risks similar to those the world has experienced with oil.
Medical Isotopes
A radioactive material called technetium-99m is used in tens of millions of diagnostic imaging procedures each year, from heart scans to cancer detection. Its parent material is produced in a small number of nuclear reactors around the world, most of which are 40 to 50 years old with uncertain remaining lifetimes. When even one of these aging reactors shuts down for maintenance, the global supply tightens. When two go offline simultaneously, hospitals face genuine shortages and must delay or cancel procedures. Transporting the material across international borders, especially by air, adds another layer of fragility.
Donor Organs
Over 103,000 people are currently on the national transplant waiting list in the United States alone. Thirteen people on that list die every day. The gap between the number of people who need a transplant and the number of available organs has persisted for decades. Kidneys account for the longest waitlists, with some patients waiting five years or more. Advances in living donation and organ preservation have helped, but demand continues to outpace supply.
New Classes of Antibiotics
The pipeline for genuinely new antibiotics has slowed to a trickle. Only five new classes of antibiotics have been approved for human use since the year 2000. Meanwhile, antibiotic-resistant bacteria continue to evolve, rendering older drugs less effective. The core problem is economic: developing a new antibiotic costs hundreds of millions of dollars, but the finished product is prescribed sparingly to slow resistance, generating relatively little revenue. Most major pharmaceutical companies have scaled back or abandoned antibiotic research entirely, leaving a growing gap between the infections we face and the tools we have to fight them.
Essential Amino Acids
Not all scarcity is about global resources. Your body cannot manufacture nine of the twenty amino acids it needs to build proteins: histidine, isoleucine, leucine, lysine, methionine, phenylalanine, threonine, tryptophan, and valine. These must come entirely from food. Animal proteins like meat, eggs, and dairy contain all nine in sufficient quantities. Most individual plant foods do not, which is why people following plant-based diets combine sources like beans and rice, or lentils and whole grains, to cover the full set. A persistent shortage of even one essential amino acid can impair muscle repair, immune function, and the production of hormones and enzymes.