Palm kernel oil carries a significant environmental cost. It comes from the same oil palm fruit that produces regular palm oil, meaning every environmental problem linked to palm oil applies equally to palm kernel oil. The crop is responsible for roughly one-third of Indonesia’s old-growth forest loss over the past two decades, threatens nearly 200 species on the IUCN Red List, degrades tropical soils, and pollutes waterways near processing mills.
That said, the picture is more complicated than “palm oil bad, other oils good.” Oil palm produces far more oil per hectare than any alternative crop, so replacing it with soybean or sunflower oil could actually require more land and cause more deforestation overall. Understanding the full picture helps you make more informed choices.
Palm Kernel Oil and Palm Oil Share the Same Supply Chain
An oil palm fruit has two oil-producing parts: the fleshy outer portion yields palm oil, and the inner seed (the “kernel”) yields palm kernel oil. Both are extracted from the same harvest on the same plantations, so there is no separate farming footprint for palm kernel oil. Any demand for palm kernel oil drives the same plantation expansion, the same deforestation, and the same processing waste as palm oil. Global palm oil production hit about 78 million metric tons in the 2024/2025 marketing year, with palm kernel oil adding several million more on top of that.
Deforestation and Carbon Loss
Oil palm expansion has been one of the largest single drivers of tropical deforestation. A nationwide satellite analysis covering Indonesia from 2001 to 2019 found that oil palm plantations directly replaced 29% to 32% of all forest lost during that period. Industrial-scale plantations accounted for about 22% of total forest loss, while smallholder farms added another 7%. In total, oil palm was responsible for roughly one-third of Indonesia’s old-growth forest destruction over two decades.
The damage extends beyond direct clearing. When large plantations take over farmland, displaced farmers often move deeper into forested areas to grow food. This process, known as indirect land-use change, is especially hard to prevent because it involves small-scale farmers using slash-and-burn methods to open new plots in the rainforest. Even when a company avoids clearing forest on its own concession, the ripple effect of displacing local communities pushes deforestation into surrounding areas. The European Commission has flagged palm oil as having a high indirect land-use change risk for this reason.
Tropical forests and peatlands store enormous amounts of carbon. Clearing and draining them releases that carbon as CO₂, making palm oil expansion a meaningful contributor to greenhouse gas emissions well beyond the plantation itself.
Biodiversity Under Pressure
Palm oil production currently affects at least 193 species classified as threatened on the IUCN Red List. Orangutans and tigers are the most well-known casualties, but the scope is far broader. Researchers estimate that oil palm expansion could ultimately affect 54% of all threatened mammals and 64% of all threatened birds worldwide, largely because the crop grows in the same tropical belt where biodiversity is richest.
When forests are converted to orderly rows of identical palm trees, the complex ecosystem that supported hundreds of species collapses into a monoculture that supports very few. Animals displaced from cleared land often wander into plantations or nearby villages, creating human-wildlife conflicts that frequently end in the deaths of both people and animals.
Soil Degradation From Monoculture Farming
Oil palm plantations steadily drain the soil of nutrients and organic matter. Research on Indonesian plantation soils found that organic carbon levels dropped to 2.0% to 3.3%, compared to 7.7% in nearby forest soils. Soil organic matter can fall by up to 42% after forest is converted to palm. Nitrogen levels at some sites plummeted from 0.32% under forest cover to just 0.06% after conversion.
To compensate, mature palm plantations require heavy fertilizer inputs each year: roughly 215 to 286 kilograms per hectare of nitrogen, 143 to 215 of phosphorus, and 358 to 429 of potassium, along with magnesium and boron. On nutrient-poor soils, those requirements climb even higher. This reliance on synthetic fertilizers introduces its own problems, including the accumulation of trace contaminants in the soil over time, which further reduces long-term productivity and economic returns.
Water Pollution From Processing Mills
Extracting oil from palm fruit generates large volumes of wastewater called palm oil mill effluent, or POME. This liquid is loaded with biodegradable organic matter, but it also contains toxic compounds. Testing has identified copper, zinc, and phenol-based chemicals as the main toxicants in mill discharge. Volatile silicone compounds detected in the effluent have also been flagged as potentially toxic to aquatic life, even at low concentrations.
When POME is released without adequate treatment, it can devastate local waterways. Lab tests using tiny freshwater crustaceans (a standard measure of water toxicity) showed toxicity levels high enough to harm aquatic organisms across multiple samples. In regions where enforcement of discharge standards is weak, untreated or poorly treated effluent routinely enters rivers and streams.
The Land Efficiency Argument
Here is where the environmental calculus gets tricky. Oil palm is dramatically more productive than any competing oilseed crop. It yields an average of 3.3 tonnes of oil per hectare, with well-managed plantations reaching 4 to 6 tonnes. Compare that to soybean at 0.5 tonnes per hectare, rapeseed at 0.7, and sunflower at 0.8. Oil palm currently produces over 90 million tonnes of oil on about 29 million hectares. The three major annual oilseed crops collectively produce 121 million tonnes but require 191 million hectares to do it.
This means boycotting palm kernel oil (or palm oil generally) and switching to alternatives could require five to six times more land to produce the same amount of oil. That additional land would likely come from forests and grasslands in South America, North America, or Eastern Europe, trading one set of environmental problems for another. The question isn’t simply whether palm kernel oil harms the environment. It does. The question is whether the alternatives would cause less total harm at the same scale of production.
Does Certification Help?
The Roundtable on Sustainable Palm Oil (RSPO) is the most prominent certification system. A study published in the Proceedings of the National Academy of Sciences found that RSPO certification reduced deforestation by 33% on certified plantations, dropping annual forest loss from 9.8% to 6.6%. In Kalimantan (Indonesian Borneo), the effect was even stronger: a 40% reduction in deforestation.
But the results come with serious caveats. Certification had no significant effect on fire or peatland clearing, two of the most environmentally damaging practices in the industry. And certified plantations still lost 84% of their year-2000 forest cover by 2015. In Sumatra, the reduction in forest loss from certification was not statistically significant. Certification helps at the margins, but it has not solved the core problem of habitat destruction. Looking for RSPO-certified products is better than ignoring the issue entirely, but it is not a guarantee that the oil in a product was produced without environmental harm.
What This Means in Practice
Palm kernel oil appears in a wide range of everyday products: soaps, detergents, cosmetics, processed foods, and industrial chemicals. Its environmental footprint is real and substantial, touching deforestation, biodiversity loss, soil degradation, water pollution, and climate change. At the same time, simply eliminating it from the global supply chain without a plan would likely shift production to less efficient crops, requiring vastly more farmland.
If you want to reduce your personal impact, prioritizing products with RSPO certification is a reasonable step, while recognizing its limitations. Reducing overall consumption of processed products that rely heavily on vegetable oils has a more straightforward effect. The most meaningful changes, though, will come from stronger land-use policies in producing countries and corporate supply chain commitments that go beyond certification labels.