Is organic farming better for the environment than conventional farming?

Organic farming avoids synthetic inputs like synthetic fertilizers, pesticides, and GMOs (genetically modified organisms), while conventional farming uses these inputs. Organic farming allows some non-synthetic chemicals approved by the USDA National Organic Program. In livestock, organic farming restricts antibiotics and requires animals to graze outdoors, whereas conventional farming has no such constraints. These differences shape farming methods: conventional farming often uses synthetic herbicides, enabling low-till techniques, while organic farming relies more on mechanical weed control or mulching. The debate over which system is better for the environment is complex and often oversimplified.

Ecotoxicity measures how harmful farming chemicals are to plants, insects, and aquatic life. Organic farming nearly always scores lower on ecotoxicity because it avoids synthetic pesticides. A 2024 meta-analysis by Fatemeh Hashemi and colleagues reviewed 100 studies and found organic farming consistently had much lower ecotoxicity scores. However, some organic-approved chemicals, like copper sulfate, can still be harmful in certain cases. Organic farming also tends to support greater biodiversity, with more plant, insect, and bird species in organic fields. These benefits are strongest at the field level but diminish when looking at entire farms or surrounding areas.

Conventional farming consistently uses less land to produce the same amount of food. A 2024 meta-analysis found that organic farming required a median of 64% more land to produce one kilogram of food compared to conventional methods. This is because organic farming typically yields less per hectare. For example, organic wheat production might yield 3 tons per hectare, while conventional wheat might yield 5 tons per hectare. Higher land use in organic farming can lead to greater carbon opportunity costs, as more land could otherwise be used for carbon-sequestering forests or grasslands.

Neither organic nor conventional farming consistently performs better in terms of greenhouse gas emissions (carbon emissions). Organic farming may emit less carbon per hectare because it avoids synthetic fertilizers and pesticides, but it often requires more land, which can offset these gains. Synthetic fertilizers in conventional farming contribute to emissions through energy-intensive production and the release of nitrous oxide (N₂O), a potent greenhouse gas. Organic farming uses manure or compost instead, but these also release N₂O. Across 100 studies, there was no statistically significant difference in carbon emissions between the two systems when measured per kilogram of food produced.

Two key metrics for water pollution are acidification (harmful to aquatic life due to acid rain-like effects) and eutrophication (nutrient runoff that causes algae blooms and oxygen depletion in water). Organic farming performs better per hectare in these areas, but when measured per kilogram of food, there is no clear winner. Conventional farming’s synthetic fertilizers and pesticides contribute to these issues, but organic farming’s reliance on manure and mechanical tillage can also lead to nutrient runoff and soil disturbance. The results are mixed across studies, with no consistent advantage for either system.

The type of food consumed has a far greater impact on climate than whether it is organic or conventional. For example, the carbon footprint of beef is 3,300% to 10,000% higher per kilogram than peas. Even the largest differences between organic and conventional versions of the same food (up to 50%) are negligible compared to switching from plant-based to animal-based foods. Location-specific factors like climate, soil quality, and farming techniques also play a significant role, often outweighing the differences between organic and conventional systems.

Nearly half of the world’s habitable land is used for agriculture, and this expansion has displaced one-third of the world’s forests. A shift to organic farming could increase land use further, as organic systems typically require more land to produce the same amount of food. A 2024 study modeled England and Wales adopting organic farming and found that while greenhouse gas emissions per hectare would decrease, total emissions could rise due to increased land use overseas to compensate for lower yields. This spillover effect highlights the global impact of local farming choices.

Around half of the global population relies on synthetic fertilizers for their food. An entirely organic farming system would struggle to produce enough nitrogen to feed 8 or 9 billion people, as organic fertilizers like manure are less nitrogen-dense and harder to scale. This dependency underscores the trade-offs between environmental goals and food security. Organic farming’s lower yields and higher land demands could exacerbate food shortages if not accompanied by significant dietary shifts or technological innovations.