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Agriculture

Dairy farms reduce emissions with seaweed feed supplement

by Matt Blois
May 14, 2022 | A version of this story appeared in Volume 100, Issue 17
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Most Popular in Food

Glass tanks growing seaweed.
Credit: Blue Ocean Barns
Blue Ocean Barns grows seaweed in tanks near its offices in Kona, Hawaii, and in San Diego.

Blue Ocean Barns will supply some dairy farms in California with a feed supplement made from dehydrated red seaweed. The state’s Department of Food and Agriculture approved the product for commercial use last month. Blue Ocean claims the supplement reduces methane emissions from cow burps by 45–80%. The company has been growing seaweed at commercial scale since 2020. Last fall DSM introduced the additive 3-nitrooxypropanol, which it says reduces methane emissions by 30%.

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