How Much CO₂ is in Your Morning Coffee? The Hidden Emissions of Milk

Published on April 15, 2025

How Much CO₂ is in Your Morning Coffee? The Hidden Emissions of Milk

A Greener Glass: How to Make More Sustainable Milk Choices

Whether we start our day with a refreshing glass of milk, pour it into our morning tea or coffee, or add it to our cereal bowl, milk has become an essential part of our daily lives. However, while we often think about the nutritional benefits of milk, we may overlook its environmental impact.

The dairy industry is a major contributor to greenhouse gas (GHG) emissions, while plant-based alternatives vary in their environmental impact based on factors like water usage, land requirements, and production emissions. Making informed choices about the milk we consume can play a small yet significant role in building a more sustainable future. Let us take a closer look at how different types of milk contribute to our carbon footprint.

The Carbon Footprint of Dairy Milk

Milk production has a significant environmental impact and requires substantial resources. Its carbon footprint is influenced by several key factors:

  1. GHG Emissions: Producing one litre of dairy milk generates approximately 3.2 kg of CO₂-equivalent emissions considerably higher than most plant-based alternatives. These emissions arise from multiple sources:
    • Methane Production: Cows release methane during digestion, a greenhouse gas with a much higher global warming potential than CO₂.
    • Manure Management: The handling and storage of manure contribute to methane and nitrous oxide emissions.
    • Feed Production: Growing feed crops involves fertilizers, irrigation, and machinery, all of which add to CO₂ emissions.
  2. Land and Water Usage: Producing one litre of dairy milk requires approximately 8.9 m² of land and 628 litres of water. The land used for dairy farming could otherwise support carbon-sequestering vegetation, while the high water consumption contributes to resource depletion.

The Dairy Industry's Contribution to Global GHG Emissions

The dairy sector is a significant contributor to greenhouse gas (GHG) emissions worldwide. Key statistics highlight its impact:

·        Global Emissions: The dairy industry is responsible for approximately 4.0% of total human-induced GHG emissions. These emissions arise not only from milk production but also from processing, transportation, and supply chain operations.

·        Regional Differences: Emission levels vary across regions due to differences in herd management, farming techniques, and production efficiency. Developed countries, which commonly adopt advanced technologies and sustainable practices, tend to have lower emissions per litre of milk compared to many developing regions, where traditional methods are more prevalent.

Horizontal stacked bar chart showing the percentage breakdown of total greenhouse gas emissions in dairy production across different regions, categorized into sources such as enteric fermentation, manure management, feed, fertilizer, and upstream processes.

Figure: Breakdown of greenhouse gas emissions for dairy production across different regions and years, highlighting the impact of factors like enteric fermentation, manure management, feed, and fertilizer. (Source: Mapping the carbon footprint of milk production from cattle: A systematic review Mazzeto et al.)

Comparing Plant-Based Milk Alternatives

Plant-based milk has emerged as a more environmentally friendly alternative to dairy milk. Below is a comparison of some of the most common options based on their environmental impact and nutritional profile.

Almond Milk

  • GHG Emissions: Produces approximately 0.7 kg of CO₂-equivalent emissions per litre.
  • Water Usage: Almond farming requires significant water resources, consuming about 371 litres of water per litre of almond milk.
  • Nutritional Profile: Lower in calories and protein compared to dairy milk.

Soy Milk

  • GHG Emissions: Generates around 0.98 kg of CO₂-equivalent emissions per litre.
  • Water Usage: Requires approximately 0.66 m² of land and 28 litres of water per litre.
  • Nutritional Profile: A strong alternative with protein content comparable to dairy milk.

Oat Milk

  • GHG Emissions: Produces around 0.9 kg of CO₂-equivalent emissions per litre.
  • Water Usage: Requires about 0.76 m² of land and 48 litres of water per litre.
  • Nutritional Profile: Rich in vitamins and minerals with a moderate protein content.

Graph comparing the environmental impact of cow milk, almond milk, oat milk, and soy milk, indicating greenhouse gas emissions and land use for each type. Cow milk shows the highest emissions, while oat milk has the lowest.

Figure: Comparative environmental impact of different milk types, showcasing their greenhouse gas emissions and land use.

Making Sustainable Choices

Reducing the environmental impact of milk consumption can be as simple as making mindful choices. Here are some ways to make a more sustainable impact:

  • Opt for Plant-Based Alternatives: Choosing plant-based milks like oat or soy can significantly reduce your carbon footprint. These alternatives generally require fewer resources, such as land and water, and generate lower greenhouse gas emissions compared to dairy milk.
  • Support Sustainable Dairy Practices: If you prefer dairy, look for producers committed to sustainable farming. Methods such as regenerative agriculture, improved manure management, and feed optimization can help mitigate environmental harm and lower emissions.
  • Check Labels for Added Sugars and Additives: Some plant-based milks contain added sugars, stabilizers, or preservatives. Reading labels carefully ensures that your choice aligns with both health and sustainability goals.

Additional Ways to Make a Difference:

  • Choose Organic or Locally Sourced Milk: Organic dairy farming often follows better animal welfare and environmental practices. Locally produced milk (whether dairy or plant-based) helps reduce emissions from transportation.
  • Consider Packaging Impact: Opt for brands that use eco-friendly packaging or offer refillable or recyclable options to further minimize waste.
  • Reduce Milk Waste: Only buy and consume what you need. Proper storage can prevent spoilage, and using milk alternatives in multiple ways (smoothies, baking, cooking) can help minimize waste.

A guide to selecting environmentally friendly milk options, including factors such as plant-based alternatives, local sources, eco-friendly packaging, and certifications.

 

Being aware of the environmental impact of both dairy and plant-based milk allows us to make informed choices that support sustainability. Small, conscious decisions such as opting for a milk alternative with a lower carbon footprint or supporting sustainable dairy farming can collectively make a significant difference. By choosing responsibly, we can reduce greenhouse gas emissions, conserve natural resources, and contribute to a healthier planet for future generations. Every step toward sustainability, no matter how small, helps create a more environmentally responsible way of living.

 

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