Seaweed-Based Solutions for Livestock Emissions Falter Due to Environmental Concerns

Strategic Insights -

A recent study conducted by researchers at the Curtin University Sustainability Policy (CUSP) Institute has shed light on the challenges surrounding the use of seaweed as a solution to mitigate methane emissions in the livestock industry. The research highlights the need for a broader approach to methane mitigation, beyond feed additives, to ensure sustainable outcomes for livestock agriculture. The study found that while seaweeds such as Asparagopsis taxiformis contain bromoform, a bioactive compound that reduces enteric methane production, its potential carcinogenicity and ozone-depletion effects raise environmental concerns.

Key Takeaways:

  • Methane emissions from livestock, particularly enteric fermentation in ruminants, account for 40% of global total emissions, with 90% attributed to agricultural methane emissions.
  • Seaweed-based solutions, such as Asparagopsis taxiformis, contain bromoform, which reduces enteric methane production, but raises environmental concerns including carcinogenicity and ozone-depletion effects.
  • Scaling up seaweed production for enteric methane reduction in livestock poses key challenges, including sustainability, biodiversity risks, and upstream emissions possibly offsetting methane reduction gains.
  • Animal health concerns, such as reduced weight gain and mucosal irritation, also warrant attention, and supply chain logistics, cultivation, and harvesting practices, and bromoform retention require further development.
  • The limited assessment of ozone depletion potential underscores the need for further research and techno-feasibility and life cycle assessment before scaling up seaweed-based solutions.
  • A broader approach to methane mitigation, beyond feed additives, is essential to ensure sustainable outcomes for livestock agriculture.

Statistics:

  • Methane has a global warming potential over 84 times greater than carbon dioxide over its relevant lifespan (CUSP Institute, 2025).
  • Current atmospheric methane concentrations are at a record high, significantly contributing to near-term climate warming (CUSP Institute, 2025).
  • 40% of global methane emissions come from livestock, with 90% attributed to agricultural methane emissions (CUSP Institute, 2025).
  • Seaweed production for enteric methane reduction in livestock is limited by sustainability, biodiversity risks, and upstream emissions (CUSP Institute, 2025).
  • Bromoform, a bioactive compound in seaweeds, raises environmental concerns including carcinogenicity and ozone-depletion effects (CUSP Institute, 2025).

Sources:

  • CUSP Institute, M. (2025). Scaling up Seaweed Production for Enteric Methane Reduction: A Systematic Literature Review on Environmental and Ozone Impacts in the Case of Asparagopsis Macroalgae. Methane, 2025, 4(2), 9. doi: 10.3390/methane4020009