The Environmental Impact of Plant-Based Milks vs. Dairy: What the Data Says

As consumers become more conscious of their ecological footprint, the choice between plant-based milks and dairy has moved beyond personal health into the realm of environmental stewardship. The data is increasingly clear: swapping a glass of cow’s milk for a plant-based alternative can significantly reduce your carbon footprint, water usage, and land impact. But not all plant milks are created equal, and understanding the nuances of sustainability can help you make informed decisions that align with your values.

In this article, we dive into the latest scientific research and lifecycle assessments to compare the environmental impact of dairy milk with popular plant-based options like oat, almond, cashew, and walnut milks. We’ll also highlight how choosing products from Elmhurst 1925—a brand committed to clean ingredients and minimal processing—can amplify your positive impact on the planet.

Carbon Footprint: Plant Milks vs. Dairy

According to a landmark study from the University of Oxford, dairy milk produces nearly three times the greenhouse gas emissions of any plant-based milk. While a glass of cow’s milk generates approximately 3.2 kg of CO₂ equivalent, oat milk comes in at about 0.9 kg, almond milk at 0.7 kg, and cashew milk at even lower levels. The primary driver of dairy’s high carbon footprint is methane from cattle digestion and the energy-intensive processes of feed production and manure management.

For shoppers looking to minimize their climate impact, switching to plant-based milks is one of the most effective dietary changes. Elmhurst 1925’s Unsweetened Oat Milk, for example, is made with just a few simple ingredients and a proprietary hydro-release process that preserves the grain’s natural nutrients while keeping emissions low. Similarly, their Cashew Creamer Variety Pack offers a creamy, low-carbon alternative for coffee lovers who want to reduce their dairy footprint without sacrificing taste.

• Dairy milk: ~3.2 kg CO₂e per liter
• Oat milk: ~0.9 kg CO₂e per liter
• Almond milk: ~0.7 kg CO₂e per liter
• Cashew milk: ~0.6 kg CO₂e per liter

Water Usage: A Deeper Look at Almond and Walnut Milks

Water scarcity is a critical environmental issue, and the water footprint of different milks varies dramatically. Dairy milk requires about 628 liters of water per liter of milk, largely for growing cattle feed and maintaining livestock. Among plant-based options, almond milk has faced scrutiny for its water use—roughly 371 liters per liter—due to the irrigation demands of almond orchards in drought-prone California. However, this is still significantly less than dairy.

Newer plant milk ingredients like walnuts and cashews offer even better water profiles. Walnuts, for instance, require about 200 liters of water per liter of milk, and they grow in regions with more abundant rainfall. Elmhurst 1925’s Maple Walnut Barista Edition brings this sustainable nut milk to coffee shops and home kitchens, delivering a rich, frothy texture with a fraction of dairy’s water impact. Choosing such options helps conserve water without compromising on creaminess.

• Dairy: 628 L of water per liter of milk
• Almond milk: 371 L per liter
• Oat milk: 48 L per liter
• Walnut milk: ~200 L per liter

Land Use and Biodiversity: Why Plant Milks Win

Dairy farming consumes vast amounts of land—about 9 square meters per liter of milk—for grazing and growing feed crops. This land use often comes at the expense of forests and natural habitats, contributing to biodiversity loss. In contrast, plant-based milks require far less land: oat milk uses about 0.8 square meters per liter, and almond milk about 0.5 square meters. Cashew and walnut milks are similarly land-efficient, especially when sourced from agroforestry systems.

By choosing plant-based milks from Elmhurst 1925, you support a supply chain that prioritizes clean, simple ingredients grown with respect for the land. Their Almond Barista Edition, for instance, uses almonds that are carefully sourced to minimize environmental impact, while their Oat Barista Edition relies on oats—a crop that can be grown in rotation with other plants to improve soil health. Every carton you buy helps reduce the pressure on ecosystems.

• Dairy: ~9 m² of land per liter
• Oat milk: ~0.8 m² per liter
• Almond milk: ~0.5 m² per liter
• Cashew milk: ~0.4 m² per liter

The Role of Processing and Packaging in Sustainability

While ingredient sourcing is vital, the environmental impact of processing and packaging also matters. Many plant milks undergo heavy processing, including high heat, emulsifiers, and gums, which can increase energy use and waste. Elmhurst 1925 differentiates itself with a patented hydro-release process that uses only water and mechanical separation to extract nutrients from nuts and grains—no added oils, gums, or preservatives. This clean approach reduces energy consumption and results in a purer product.

Packaging is another consideration. Elmhurst 1925 uses shelf-stable cartons that are recyclable and lightweight, reducing transportation emissions. Their seasonal offerings like Oat Nog and limited-edition flavors such as Maple Walnut Latte come in the same eco-friendly packaging, making it easy to enjoy sustainable indulgence. By choosing brands that prioritize minimal processing and responsible packaging, you amplify the environmental benefits of going plant-based.

• Elmhurst 1925 uses a hydro-release process with no added oils or gums
• Shelf-stable, recyclable cartons reduce transport weight and waste
• Minimal processing lowers energy use compared to many competitors

How to Make the Most Sustainable Choice for Your Coffee and Kitchen

For the most eco-friendly option, consider the full lifecycle of your milk. Oat milk generally has the lowest overall environmental impact across carbon, water, and land metrics, but local sourcing and packaging can tip the scales. If you love nut milks, choose those with lower water footprints like cashew or walnut, and look for brands that source responsibly. Elmhurst 1925’s Cashew Barista Edition, for example, combines creamy texture with a relatively low environmental burden, making it an excellent choice for lattes and cappuccinos.

Another tip: buy in bulk or in variety packs to reduce packaging waste per serving. The Cashew Creamer Variety Pack from Elmhurst 1925 offers four delicious flavors in one box, cutting down on individual carton waste while letting you sample different profiles. And for seasonal treats, the Oat Nog is a limited-run product that brings festive flavor without the heavy footprint of dairy eggnog.

• Oat milk generally has the lowest combined environmental impact
• Choose nut milks with lower water footprints (cashew, walnut)
• Buy variety packs to reduce packaging waste

The data is compelling: switching from dairy to plant-based milks can slash your carbon footprint, conserve water, and protect land for biodiversity. Brands like Elmhurst 1925 make it easy to choose clean, sustainable options without sacrificing taste or texture. Whether you're a barista crafting the perfect latte or a home cook looking for a creamy addition to your morning coffee, there’s a plant-based milk that fits your environmental goals. Explore the Unsweetened Oat Milk or any of their barista editions to start making a difference—one delicious sip at a time.