Is Tofu Bad for the Environment?

Tofu’s environmental footprint is far smaller than that of the animal proteins it typically replaces, generating roughly 22 to 34 times fewer greenhouse gas emissions than beef per kilogram of product.¹ That does not mean its footprint is zero. Growing soybeans, processing them into tofu, managing wastewater, and shipping the finished product all carry environmental costs. But the honest framing is that tofu sits near the low end of the protein spectrum for climate impact, and the interesting questions are about where within that low range its problems actually lie.

How Tofu’s Carbon Footprint Compares to Meat

A lifecycle analysis of tofu production estimated total greenhouse gas emissions at about 893 grams of CO2 equivalent per kilogram of tofu.¹ To put that in perspective, beef typically lands somewhere around 20 to 30 kilograms of CO2 equivalent per kilogram of product, depending on the production system. Tofu produces a fraction of the emissions not just compared with beef but also compared with most other animal-sourced proteins. Poultry and pork sit much lower than beef, but tofu and other conventional plant-based replacements like tempeh and pulses still tend to come in below them.²

The reason for the gap is straightforward. Raising animals, especially ruminants like cattle, means growing feed crops, transporting that feed, housing the animals, managing their waste, and contending with methane from their digestion. Each step adds emissions. Tofu skips most of those layers: you grow soybeans and process them into food directly. There is no feed-conversion step, no enteric methane, and far less manure to deal with.

The Deforestation Question

If you have read that soy is driving deforestation in the Amazon and the Cerrado, that is largely true. But it matters enormously which soy you are talking about. The vast majority of the world’s soybean crop goes to animal feed, not to tofu or soy milk. When forests or savanna are cleared for soy plantations, the resulting beans overwhelmingly end up in the bellies of livestock, which are then sold as meat and dairy. The tofu on your plate accounts for a small slice of global soy demand.

That said, soy expansion has caused real damage. In Brazil’s Cerrado, a vast tropical savanna with extraordinary biodiversity, soy expansion accounted for about 22% of habitat conversion between 2003 and 2014.³ In the southern Amazon, a shift occurred during the late 2000s: increased soy production came mostly from expanding onto already-cleared pasture rather than cutting new forest. Between 2006 and 2010, about 91% of cropland expansion happened on previously cleared land.⁴ That shift was driven partly by the Amazon Soy Moratorium, a voluntary agreement among traders not to buy soy grown on newly deforested land. It worked, at least in the Amazon proper. The Cerrado, which lacks the same protections, has continued to lose native vegetation.

The deforestation question matters for tofu’s environmental story, but the connection is indirect. If you eat tofu instead of beef, you are actually reducing overall demand for soy, because it takes several kilograms of soy-based feed to produce one kilogram of beef. Clearing land to grow feed for cattle is a much bigger driver of deforestation than growing soybeans for direct human consumption. Research has also found that continuing to destroy native vegetation in soy-growing regions is economically self-defeating: the loss of climate regulation from cleared forests and savanna reduces soy yields over time, costing the soy economy itself substantial revenue per hectare each year.⁵

What Happens Inside a Tofu Factory

Growing soybeans is only part of the story. Turning those beans into tofu requires energy, water, and generates waste streams that can cause problems if mismanaged. An energy audit of tofu factories found that the cooking step dominates energy use, and the energy source matters enormously. Factories burning firewood consumed about 71 megajoules per kilogram of tofu, while those using LPG used roughly 17 MJ/kg, and wood pellets brought it down to around 6 MJ/kg.⁶ That is a tenfold range depending on how the factory heats its boilers, which means the carbon footprint of a block of tofu varies dramatically by country and factory type.

Water use and wastewater are the other major factory-level concerns. Making a kilogram of tofu requires roughly 25 liters of water and produces about 14.5 liters of wastewater.⁶ That wastewater is rich in organic matter. If dumped into waterways untreated, it feeds microbial growth that depletes oxygen and harms aquatic life. In many small-scale tofu operations, particularly in Southeast Asia, this is exactly what happens. Wastewater from small and medium enterprises often goes unmanaged because operators lack the capital or technical knowledge to treat it.⁷

The good news is that tofu wastewater is not just a waste problem; it is also a potential energy source. Researchers have demonstrated that anaerobic fermentation of tofu-processing wastewater can produce hydrogen and ethanol, generating enough energy to offset a small portion of factory consumption and reducing CO2 emissions by several tonnes per year at a single facility.⁸ Whether factories adopt these technologies depends on investment and regulation, but the pathway from waste to energy exists.

Byproducts and What Becomes of Them

Tofu production generates a significant solid byproduct called okara, the pulp left after soybeans are ground and strained. There is also soy whey, the liquid separated during coagulation. Together, these byproducts represent a real environmental burden if they are simply discarded. When okara decomposes in landfills or open dumps, it produces methane. When soy whey runs into waterways, it contributes to oxygen depletion.

The environmental picture improves considerably when these byproducts are put to use. In Japan, okara is dried and sold as a high-fiber flour substitute. In Indonesia, it becomes a fermented food called tempe gembus. Soy whey can serve as a coagulant for the next batch of tofu or be fed into biogas digesters. A review of soybean byproduct valorization emphasized that developing effective waste management for okara and soy whey can simultaneously reduce environmental harm and address nutritional gaps, since both byproducts retain substantial protein and fiber.⁹ The key variable is not whether solutions exist but whether they are economically accessible to the small factories that produce most of the world’s tofu.

Pesticides, Herbicides, and Biodiversity on Soy Farms

The environmental story of soybeans does not end with carbon. A large share of the world’s soybean crop is genetically modified to tolerate herbicides, primarily glyphosate. This allows farmers to spray broad-spectrum herbicides across entire fields, killing weeds without harming the soy plants. It is efficient for the farmer but damaging for everything else living in and around the field. Scientific data show that agricultural intensification and herbicide use are among the main drivers of biodiversity loss, and that herbicide-resistant crops contribute to this loss in multiple ways: by reducing the diversity of wild plants in and near fields, by harming soil microorganisms, and by affecting arthropod and bird populations that depend on a varied plant base.¹⁰

This is not a problem unique to soy; virtually all large-scale monoculture farming degrades local biodiversity. But because soybean cultivation covers such a vast area globally, its aggregate effect on ecosystems is substantial. If you care about biodiversity alongside carbon, the farming system matters at least as much as the crop choice. Soybeans grown in biodiverse-rich regions with heavy herbicide regimes carry a larger ecological cost than soybeans grown in established agricultural areas with integrated pest management.

Nutrient Runoff From Soy Fields

Fertilizer use on soy farms contributes to eutrophication, the nutrient enrichment of rivers, lakes, and coastal waters that triggers algal blooms and oxygen-depleted dead zones. The intensive application of nitrogen and phosphorus fertilizers across agricultural land is a well-documented driver of this problem.¹¹ Soybeans, however, have a partial built-in advantage here. They fix their own nitrogen through a symbiotic relationship with soil bacteria, which means they need less synthetic nitrogen fertilizer than crops like corn or wheat.

That nitrogen-fixing ability is a genuine environmental benefit. Soybeans in rotation with other crops can enrich soil nitrogen naturally, reducing the need for fertilizer in subsequent growing seasons and lowering associated greenhouse gas emissions.¹² Field studies across different settings have confirmed that soybeans fix meaningful quantities of atmospheric nitrogen in their biomass, though the amount varies with soil type, local varieties, and management practices.¹³ In practice, though, plenty of large-scale soy farmers still apply phosphorus fertilizers and sometimes supplemental nitrogen, so nutrient runoff remains a concern even if it is lower per hectare than for many grain crops. A comparison of rainfed and irrigated soybean systems found that their eutrophication potential was broadly similar regardless of irrigation method, sitting around 19 to 27 kilograms of phosphate equivalent per hectare.¹⁴

Organic, Conventional, and Regenerative Soy

You might assume that organic soybeans are automatically greener, but the picture is more complicated. A study of Korean soybean farms found that conventional farming was significantly more energy-efficient than organic, largely because organic operations used more fuel and plastic mulch film while producing smaller crop yields. Greenhouse gas emissions per tonne were not significantly different between the two systems: about 2,045 kg CO2 equivalent per tonne for organic and roughly 1,658 for conventional.¹⁵ Lower yields in organic farming mean you need more land to produce the same amount of food, which partially offsets the per-hectare emissions gains.

Regenerative agriculture, which emphasizes soil health through cover cropping, reduced tillage, and diverse rotations, appears to perform better than both organic and conventional systems by some measures. A modeling study comparing the three systems in a maize-soybean rotation found that regenerative agriculture had the lowest global warming potential both per hectare and per tonne of soybeans, coming in well below conventional and organic.¹⁶ Regenerative methods achieved this by building soil carbon while maintaining reasonable yields. The evidence here is still growing, and not every farm can transition easily, but it suggests that how soybeans are grown matters as much as whether they are grown organically.

Tofu Is Not Soy Protein Isolate

One source of confusion in environmental debates about soy-based foods is the difference between whole tofu and the highly processed soy protein isolate (SPI) found in many plant-based meat substitutes. Tofu is made by a relatively simple process: soak beans, grind them, boil the slurry, strain it, and coagulate the resulting soy milk. Soy protein isolate, by contrast, involves extensive mechanical and chemical processing of soybean meal to concentrate the protein content. A lifecycle assessment of SPI found that its global warming potential per kilogram was higher than that of unprocessed chicken and pork, and comparable to beef.¹⁷

This is a striking finding because it means the environmental benefit of “eating soy instead of meat” depends heavily on which soy product you are eating. A block of firm tofu and a soy-protein-isolate-based burger patty made to look and taste like beef occupy very different spots on the environmental spectrum. The tofu sits well below most meats; the isolate-heavy product may not. If you are choosing soy foods for environmental reasons, the simplest forms of soy deliver the clearest benefits.

Packaging and the Last Mile

Tofu typically arrives at the supermarket packed in a plastic tub filled with water, then shrink-wrapped or sealed. That packaging adds a small but real environmental cost. A lifecycle assessment comparing conventional and packaging-free supermarket products found that when tofu was sold in a reusable glass container instead of its standard plastic packaging, greenhouse gas emissions actually jumped by 83%, driven mainly by the energy required to produce the glass and transport the heavier containers.¹⁸ The lesson here is counterintuitive: “less packaging” or “reusable packaging” does not always mean “less impact.” Lightweight plastic, for all its problems with ocean pollution and landfill persistence, is often the lowest-carbon option for getting a perishable wet product from factory to fridge.

Transportation further downstream also shapes the footprint. Tofu needs refrigeration, which adds energy costs during shipping. Research on Japan’s food supply chain has noted that processed soy products like tofu undergo extensive processing steps and involve self-inputs within the manufacturing sector, meaning some soy products are processed and re-processed multiple times before reaching consumers, each step adding emissions.¹⁹ For the standard block of tofu that goes through a single production step, this is less of a concern. For flavored, smoked, or pre-marinated varieties that require additional processing, the footprint grows.

Where Geography Changes the Equation

One of the trickiest things about assessing tofu’s environmental impact is that the answer varies enormously depending on where in the world you are. In East and Southeast Asia, where tofu has been a dietary staple for centuries, production is dominated by small-scale operations. Many of these use wood-fired boilers, discharge wastewater into local waterways, and have limited access to modern efficiency improvements. Their per-unit environmental impact can be surprisingly high despite the simplicity of the product.

In North America and Europe, tofu is more often made in larger, mechanized facilities that use natural gas or electricity for heating and have at least basic wastewater treatment. The emissions per kilogram tend to be lower, but the soybeans may have traveled thousands of kilometers from farms in the American Midwest or South America, adding transport emissions. The sources of electricity also matter: tofu made in a country with a coal-heavy grid carries a heavier carbon burden than the same tofu made where the grid runs on renewables or nuclear.

Even the choice of coagulant has a minor effect. Traditional nigari (magnesium chloride) is derived from seawater with minimal processing. Some factories use acetic acid or other chemical coagulants whose production has its own carbon footprint, though this is small relative to the energy used in cooking.⁷ The overall pattern is that context swamps category: a well-run tofu factory in a country with clean energy produces something with a tiny footprint, while a poorly managed one burning firewood and dumping waste can be less green than you would expect.

The Feed-Versus-Food Distinction

Perhaps the most important piece of context in this entire discussion is one that rarely makes it into headlines: roughly 70 to 75% of the world’s soybean crop is crushed into meal for animal feed. The oil fraction goes to cooking oil and industrial uses. Only a small percentage is processed directly into human foods like tofu, tempeh, soy milk, and edamame. When environmental campaigners talk about “soy destroying the rainforest,” they are mostly talking about feed soy, not food soy.

This distinction matters because eating tofu instead of beef does not add demand for soy. It subtracts it. A kilogram of beef requires several kilograms of soy-based feed to produce. If you swap that beef for a few hundred grams of tofu, the net effect on soybean demand is sharply negative. The environmental costs of soy agriculture are real, but attributing them to tofu when the overwhelming driver is the livestock industry misplaces the blame.

None of this makes tofu impact-free. Growing any crop at scale involves land use, water, fertilizers, and energy. Soybean monocultures displace biodiversity, and the manufacture of tofu generates waste streams that need proper management. But when you compare tofu to the animal products it replaces on a per-protein basis, the gap is large and consistent across every environmental metric that researchers have measured: greenhouse gases, land use, water consumption, and energy use.²⁰ The question is not really whether tofu is bad for the environment. It is whether the food it replaces is worse, and the answer to that is almost always yes.