Almond milk produces roughly half to a third of the greenhouse gas emissions of dairy milk, uses a fraction of the land, and generates far less acid rain pollution. By most environmental measures, it is the more sustainable choice. But the picture gets more complicated when you factor in water use, especially where those almonds are grown, and the nutritional gap between the two milks.
Greenhouse Gas Emissions
European dairy milk produces about 2.2 kg of CO2 equivalents per liter from farm to retail, one of the lowest figures globally. Plant-based milks as a category cut that carbon footprint by 59% to 71%, depending on the type. Almond milk falls on the lower end of those savings. Among plant milks, oat and soy drinks tend to have the smallest climate impact, while almond milk’s emissions are slightly higher, though still two to three times lower than dairy.
A major reason dairy’s footprint is so large comes down to cow digestion. Methane released from the fermentation of feed inside a cow’s stomach accounts for roughly 50% of milk’s total greenhouse gas emissions. Methane is a far more potent warming gas than CO2 over a 20-year period. While emissions per liter of dairy have been dropping about 1% per year as farms become more efficient, the total output per cow has actually been rising at the same rate because each cow now produces more milk on higher feed volumes.
Water Use Is the Weak Spot
This is where almond milk loses its clear advantage. Per cup (240 mL), almond milk requires about 9 liters of water compared to roughly 8 liters for cow’s milk, according to data compiled by the World Resources Institute. That makes them essentially equivalent in raw water volume. Soy milk, by contrast, needs just 1 liter per cup, and pea milk about 5.
But volume alone doesn’t capture the real problem. Nearly all U.S. almonds are grown in California, where 97% of the water consumed goes to irrigating the trees. California’s almond orchards account for roughly 15% to 17% of the state’s total agricultural water demand. Much of that irrigation draws from groundwater in regions with over-drafted aquifers and uncertain surface water supplies. When researchers calculate a water scarcity index, which adjusts for how stressed local water sources already are, almond milk scores worse than every type of dairy milk. Growing a thirsty crop in an arid, drought-prone region amplifies the ecological cost of each liter far beyond what the raw numbers suggest.
Land Use Favors Almond Milk Heavily
Dairy milk requires close to 9 square meters of agricultural land per liter, more than 11 times the land needed for its closest plant-based competitor. Almond milk, like other plant milks, needs less than a square meter per liter. Among plant-based options, almond milk is actually one of the most land-efficient. That matters because land used for cattle pasture and feed crops is a leading driver of deforestation and habitat loss worldwide. Dairy’s acidification potential, the pollution that causes acid rain, is 3 to 10 times higher than plant milks, largely because of ammonia released from manure.
The Pollinator Problem
Commercial almond production depends almost entirely on managed honeybee colonies trucked in each spring for pollination. This system puts enormous pressure on bee populations. Winter colony mortality among U.S. honeybees has roughly doubled from about 15% in 1999 to over 30% in 2019, and the concentration of bees in California almond orchards, where they’re exposed to pesticides and disease, is a contributing factor. Higher bee mortality drives up pollination costs for other crops later in the season, creating ripple effects across the food system. No other plant milk requires this kind of pollinator infrastructure.
Nutrient Density Changes the Math
Dairy milk contains 2.9% to 6% protein by weight. Almond milk contains 1.9% to 2.5%. That gap matters when you ask how much environmental damage is caused per gram of usable nutrition. A comparative analysis across 12 environmental impact categories found that plant-based milks outperformed dairy in nearly every one. But when the same data was recalculated per gram of protein rather than per liter of liquid, the gap between plant milks and dairy shrank dramatically. If you’re replacing dairy with almond milk and getting your protein from other sources, this doesn’t change your personal footprint much. But if almond milk is your primary protein source, you’d need to drink far more of it, which multiplies the water and land costs.
How Almond Farming Is Adapting
California’s almond industry has made measurable changes to reduce water use. Over 80% of almond farms now use microirrigation, which delivers water directly to tree roots instead of flooding entire fields. That adoption rate is nearly double the average for California farms overall. The industry set a goal in 2018 to cut water use an additional 20% by 2025, using tools like soil moisture meters and precision scheduling. Some farmers also practice on-farm groundwater recharge, diverting excess rainwater and snowmelt across dormant orchards after winter storms to replenish underground aquifers. These practices help, but they don’t resolve the fundamental tension of growing a water-intensive tree crop in an increasingly water-scarce region.
How Almond Milk Compares to Other Plant Milks
If sustainability is your primary concern, almond milk is a solid improvement over dairy but not the best plant-based option. Here’s how the major alternatives stack up:
- Oat milk: Lowest greenhouse gas emissions among plant milks, low water use, low ecotoxicity. The most consistently sustainable option across categories.
- Soy milk: Very low water use (about 1 liter per cup), strong protein content, comparable emissions to oat. Organic soy has higher marine pollution potential from nitrogen fertilizer.
- Almond milk: Low emissions and efficient land use, but high water demand in a drought-prone region, freshwater ecotoxicity concerns from pesticide runoff, and the worst water scarcity score of any milk studied.
- Coconut milk: Low emissions but the highest water use among plant milks at about 21 liters per cup.
Switching from dairy to any plant milk reduces your carbon footprint, land use, and contribution to acid rain. Switching from almond to oat or soy milk takes that reduction further, particularly on water. If you prefer almond milk and live outside California’s water-stressed region, the overall environmental case still favors it over dairy by a wide margin.