The Midwest region of the United States holds an unusually concentrated mix of natural resources: deep, fertile soils shaped by glaciers, the largest freshwater system on Earth, vast mineral deposits including iron ore and copper, significant fossil fuel reserves, and expansive forests and wetlands. These resources powered much of the country’s industrial growth and continue to anchor its agricultural economy. But the story is more layered than a simple inventory, because decades of intensive use have changed the condition of many of these resources and introduced tradeoffs that shape how they can be managed going forward.
Soil That Took Thousands of Years to Build
The Midwest’s most valuable natural resource, by most economic measures, is its soil. The Corn Belt stretching from Ohio through Iowa sits on deep, dark, carbon-rich earth deposited and reworked by glaciers over tens of thousands of years. Before European settlement and large-scale farming, these prairie soils eroded extremely slowly. Research on native prairie remnants in the Midwest found a median pre-agricultural erosion rate of just 0.04 millimeters per year, which is one to four orders of magnitude lower than what the U.S. Department of Agriculture considers the acceptable soil-loss tolerance for those same locations.1Geological Society of America (Geology). Pre-agricultural soil erosion rates in the midwestern United States In other words, the soil accumulated far faster than it wore away, building up a thick topsoil layer rich in organic matter over millennia.
Modern agriculture reversed that equation. Across the U.S. Corn Belt, the loss of the uppermost soil layer (the A-horizon) has been substantial enough to reduce crop yields by roughly 6%, costing an estimated $2.8 billion in annual economic losses.2PubMed Central. The extent of soil loss across the US Corn Belt That same erosion has stripped an estimated 1.4 billion metric tons of carbon from hillslopes, though much of it likely remains buried in lower-lying areas within the same fields rather than being released into the atmosphere. The scale of this change matters because the Midwest’s agricultural productivity has always rested on the quality of this topsoil, not just on rainfall or climate.
Crop choices affect the soil’s remaining carbon reserves. Research comparing corn and soybean rotations in Ohio, Indiana, Iowa, and Illinois found that corn cultivation is associated with higher soil organic carbon stocks than soybean cultivation, with an additional year of corn planted every three years estimated to increase soil carbon stocks by about 25% at depths down to one meter.3PubMed Central. Crop rotation and the impact on soil carbon in the U.S. Corn Belt That finding has implications for both soil health and climate policy, since soil carbon is essentially stored organic matter that keeps the ground fertile and productive.
Freshwater on an Enormous Scale
The Great Lakes alone hold roughly 20% of the world’s surface freshwater.4Frontiers in Water. Navigating Great Lakes Hydroclimate Data That single statistic makes the Midwest one of the most water-rich regions on the planet. Lakes Superior, Michigan, Huron, Erie, and Ontario span the northern edge of the region and supply drinking water to tens of millions of people, support commercial shipping, and sustain major fisheries. The water balance of these lakes depends on a combination of precipitation falling directly on the lake surfaces, evaporation, and runoff from surrounding tributaries, all of which fluctuate with weather patterns and climate shifts.
Below the surface, groundwater fills another enormous reservoir. Hydrologic modeling of major Michigan watersheds has shown that storage changes are dominated by subsurface components, meaning the water sitting in soil and rock formations, rather than by what you can see on the surface.5Water Resources Research. Quantifying storage changes in regional Great Lakes watersheds using a coupled subsurface‐land surface process model and GRACE, MODIS products This underground water feeds wells, sustains streams during dry periods, and supports agriculture in areas far from the Great Lakes themselves. Land use plays a direct role in how much water recharges these underground reserves versus running off the surface.
Rivers complete the picture. The Mississippi River and its tributaries form the Midwest’s other defining water system. The Upper Mississippi, stretching from Minneapolis, Minnesota, to Cairo, Illinois, has been heavily engineered with locks, dams, shallow impoundments, and thousands of channelization structures to support commercial navigation.6Restoration Ecology. River Enhancement in the Upper Mississippi River Basin: Approaches Based on River Uses, Alterations, and Management Agencies The Ohio River, Missouri River, and their many smaller tributaries provide additional water for industry, cities, and irrigation. Collectively, these river systems drain most of the region and connect it hydrologically to the Gulf of Mexico, a connection that becomes important when considering nutrient pollution downstream.
Iron, Copper, Nickel, and Silica Sand
The Midwest’s mineral wealth is concentrated primarily around the Lake Superior region and reflects the area’s deep geologic history. Minnesota’s Mesabi Range has produced 3.6 billion metric tons of iron ore since its discovery in 1890, including 2.3 billion metric tons of high-grade hematite and goethite ores.7Economic Geology. High-grade iron ore deposits of the Mesabi Range, Minnesota – product of a continental-scale proterozoic ground-water flow system This iron fueled the steel mills of Pittsburgh, Gary, and Cleveland and was central to America’s industrial rise in the twentieth century. The geology of the Biwabik Iron Formation, which underlies the Mesabi Range, is complex: its mineral composition changes dramatically both vertically through the rock layers and horizontally as the formation approaches the igneous Duluth Complex, where contact metamorphism at temperatures reaching 1,200 degrees Celsius transformed the original minerals into an entirely different suite.8PubMed. Overview of the mineralogy of the Biwabik Iron Formation, Mesabi Iron Range, northern Minnesota Today, taconite (a lower-grade iron ore processed into pellets) dominates production from the region.
Copper and nickel are the Midwest’s other signature metals. Michigan’s Upper Peninsula was once the country’s leading copper producer, with native copper deposits and the White Pine sediment-hosted copper deposit serving as major metal sources historically. More recently, interest has shifted to copper-nickel sulfide deposits hosted by the Duluth Complex in Minnesota and to the Eagle nickel mine in Michigan, signaling that the Lake Superior region’s mineral economy is evolving rather than fading.9Ore Geology Reviews. Mineral deposits of the Mesoproterozoic Midcontinent Rift system in the Lake Superior region – A space and time classification These deposits are tied to the Midcontinent Rift System, a billion-year-old geologic feature where the continent nearly split apart.
A less glamorous but industrially important mineral resource is high-purity silica sand. Certain quartz sands of Middle Ordovician age across the Midwest are prized for their purity and are extracted for a wide range of industrial uses. The principal formations crop out extensively, with the St. Peter Sandstone stretching from Minnesota to Arkansas.10U.S. Geological Survey. Map showing high-purity silica sand of Middle Ordovician age in the Midwestern states These sands are used in glassmaking, foundry work, hydraulic fracturing, and electronics manufacturing. Wisconsin, Minnesota, and Illinois have all seen significant sand mining operations expand in recent decades as demand has grown.
Lead also has a long history in the region. The Galena River valley in the Driftless Area of northwest Illinois and southwest Wisconsin contains extensive galena (lead sulfide) deposits. Native Americans mined, smelted, and traded lead from these deposits on a large scale during the Late Historic period, well before European-American settlement pushed the activity further.11Illinois Archaeology: Journal of the Illinois Archaeology Survey. Native American lead mining in the Galena River Valley and the potential for archaeological research The town of Galena, Illinois, takes its name directly from the mineral. While lead mining has largely ceased in the region, the deposits shaped settlement patterns, trade routes, and early economic development in ways still visible on the landscape.
Coal, Oil, and Natural Gas
The Illinois Basin, spanning parts of Illinois, Indiana, and western Kentucky, is one of the country’s significant coal-producing regions. Its estimated recoverable reserves stand at about 1,879 million metric tons, representing roughly 13% of U.S. reserves. Most of the basin’s current production comes from just two coal seams, the Springfield and the Herrin, which together account for 86% of output. Both seams average about 1.5 meters thick where they are mined. The coal is high-volatile bituminous with a heat content around 11,800 BTU but generally high sulfur content in the range of 3 to 5%, which limits its desirability for power generation without emissions controls.
Oil and gas are smaller contributors to the Midwest’s energy portfolio but not negligible. The Michigan Basin holds meaningful undiscovered resources: the U.S. Geological Survey estimated mean technically recoverable resources of 990 million barrels of oil, 11.4 trillion cubic feet of natural gas, and 219 million barrels of natural gas liquids.12U.S. Geological Survey. Geologic assessment of undiscovered oil and gas resources of the U.S. portion of the Michigan Basin Ohio, Kansas, and other Midwestern states also have active oil and gas production, though on a much smaller scale than Gulf Coast or Rocky Mountain producers. The region’s fossil fuel resources are real but face increasing competition from renewables and growing regulatory pressure related to carbon emissions.
Wind, Biomass, and the Biofuel Frontier
The Midwest’s flat, open terrain makes it one of the best wind energy corridors in the country. Iowa, Kansas, Minnesota, and the Dakotas consistently rank among the top states for installed wind capacity. Wind turbines have become a common sight across the agricultural landscape, often sharing fields with row crops. For many rural landowners, turbine lease payments now represent a meaningful second income stream alongside farming.
Biomass is the region’s other major renewable resource, tied directly to its agricultural dominance. Corn stover, the stalks, leaves, and cobs left after harvest, has attracted attention as a feedstock for biofuel production. Researchers evaluating sustainability across the Midwestern U.S. have modeled multiple pathways for converting corn stover into renewable jet fuel, finding hydrothermal liquefaction to be the most cost-effective at about $4.64 per gallon and Fischer-Tropsch synthesis to be the most climate-friendly with greenhouse gas emissions of only 0.10 kilograms of CO₂ per gallon.13Renewable and Sustainable Energy Reviews. Multi-objective optimization for sustainable renewable jet fuel production: A case study of corn stover based supply chain system in Midwestern U.S.
Removing crop residue from fields is not without consequences, though. Corn stover left on the ground protects the soil from rain and wind erosion. Research using agroecosystem modeling has explored the sediment and carbon losses caused by partial stover removal in the Midwest, and the results suggest that the tradeoff between biofuel production and soil conservation requires careful management.14Scientific Reports. Soil erosion and lateral carbon fluxes from corn stover-derived biofuel Stripping too much residue accelerates erosion, which circles back to the same topsoil-loss problem the region is already dealing with. The challenge is finding a removal rate that feeds the biofuel supply chain without degrading the soil that grows the corn in the first place.
Forests and Wetlands
The northern Midwest, particularly Wisconsin, Michigan, and Minnesota, is heavily forested. These forests supply timber for lumber, paper, and wood products. They also provide ecosystem services like carbon storage, water filtration, and wildlife habitat that do not show up on commodity balance sheets. Forest management in the region increasingly has to navigate conflicts between timber production and other uses. Landscape-level modeling of northern Wisconsin forests, for example, has shown that limiting harvest areas by using buffers around residential development shifts the landscape toward older forests with more late-successional species, at the cost of reducing early-successional habitat and potentially increasing vulnerability to windthrow.15Oxford Academic (Forest Science). Simulating Landscape-Level Effects of Constraints to Public Forest Regeneration Harvests due to Adjacent Residential Development in Northern Wisconsin As residential development pushes further into forested areas, these kinds of tradeoffs will only intensify.
Wetlands represent another critical Midwest resource, though the region has lost a huge share of its original wetland area to drainage for farming. Minnesota’s peatlands are a case in point. Research comparing drained and rewetted peatlands in Minnesota found that rewetted sites had lower overall carbon dioxide emissions but substantially higher methane fluxes, with open water areas producing extremely high methane emissions at both sites.16Restoration Ecology. Environmental drivers of gaseous carbon fluxes in drained and rewetted Minnesota peatlands, U. S. A. This means that restoring drained wetlands does not straightforwardly reduce greenhouse gas output; the carbon savings from lower CO₂ emissions are partially offset by higher methane release, at least in the short term. Still, wetland restoration is pursued for its other benefits: flood control, water filtration, and habitat for waterfowl and other wildlife.
Where Midwest Nutrients End Up
One of the more consequential side effects of the Midwest’s agricultural intensity is the export of nitrogen from farm fields into waterways. Nitrate is the principal nutrient transported through the Mississippi River basin that contributes to hypoxia, or oxygen-depleted “dead zones,” in the Gulf of Mexico.17Journal of Environmental Quality. Agricultural‐Nitrogen Contributions to Hypoxia in the Gulf of Mexico The connection is direct: fertilizer applied to corn and soybean fields in Iowa or Indiana enters tile drains, flows into tributaries, and eventually reaches the Gulf, where it fuels algae blooms that choke out marine life.
Solving this is harder than it sounds. Modeling of the Upper Mississippi-Ohio River Basin indicates that conventional nitrogen-management practices, like improving fertilizer timing and planting cover crops, fall short of achieving the 45% nitrogen-load reduction needed to meaningfully reduce Gulf hypoxia, even if adopted on every acre of cropland in the region. Reaching that target requires combining those practices with more ambitious interventions like constructed treatment wetlands on tile-drainage outlets, enhanced drainage ditches, restored stream channels, and reconnected floodplains.18JAWRA Journal of the American Water Resources Association. Reducing Nitrogen Export from the Corn Belt to the Gulf of Mexico: Agricultural Strategies for Remediating Hypoxia The Midwest’s water resources and its agricultural resources, in other words, are locked in a tension that neither fertilizer management alone nor modest conservation efforts can resolve.
Climate Change and Soil Erosion Projections
Climate models project changes in precipitation timing and intensity across the Midwest that will interact with existing erosion pressures. The effects are not uniform. Soil properties, shifts in when rain falls during the growing season, and changes in planting dates can all intensify, lessen, or even reverse general erosion trends depending on location.19CATENA. Climate change impacts on soil erosion in Midwest United States with changes in crop management Soils with higher water-absorbing capacity may respond differently to heavier rainfall than clay-heavy soils, and earlier spring planting can provide ground cover during months when rain historically hits bare fields hardest. The practical takeaway is that the same crop management approach will not work equally well everywhere, and local conditions will matter more as the climate shifts.
Deep Geology as a Carbon Storage Vault
One of the Midwest’s less obvious natural resources lies far beneath the surface. The Cambrian-age Mount Simon Sandstone, which underlies much of the Michigan Basin, has been evaluated for its potential to store carbon dioxide captured from power plants and industrial facilities. Estimates based on well-log data put the total geological sequestration capacity of this formation at more than 29 billion metric tons of CO₂.20Environmental Geosciences. Geological sequestration of carbon dioxide in the Cambrian Mount Simon Sandstone: Regional storage capacity, site characterization, and large-scale injection feasibility, Michigan Basin For context, total U.S. annual CO₂ emissions from energy are in the range of five billion metric tons, so a formation like this could theoretically absorb many years’ worth of emissions from the region’s power plants and factories. Several pilot injection projects have already tested the sandstone’s feasibility, and the Midwest’s combination of heavy industry, coal-fired power, and deep porous rock makes it a natural candidate for carbon capture and storage development. Whether this becomes a meaningful piece of climate strategy depends on cost, policy, and whether the technology scales beyond demonstration projects.