A feed supplement cut sheep methane 43% in a wool pilot; Theory used the wool and won a Textile Exchange award
A rare climate claim in fashion with numbers, partners and lessons attached.
Textile Exchange named Theory, owned by Fast Retailing, among winners of its 2026 Climate and Nature Impact Awards at its annual conference in Vancouver, FashionUnited reports. Theory shared the Collaboration for Global Impact Award with Australia's Congi Farm, Sea Forest and Italian mill Botto Giuseppe for a pilot that fed the seaweed-based supplement SeaFeed to 2,000 Merino sheep for 120 days.
The pilot cut enteric methane by 43%, avoiding about 54.5 tonnes of CO2e, and the wool went into Theory's spring 2026 Regal Wool collection. Theory's Gonzalo Pertile said the lessons on "measurement, traceability, cost, and scalability" mattered as much as the results. Other winners included Green Worms founder Jabir Karat, Amiha Agro's Amitabh Singh for regenerative cotton and the Circulose recycling ecosystem.
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Enteric fermentation
After exploring Theory named among winners of Textile Exchange's Climate and Nature Awards, for where sheep methane comes from, read Enteric fermentation.
Wikipedia explains the digestive process in ruminants that produces methane, which the FAO links to about 34.5% of human-caused methane emissions.
Wikipedia · Wade · 5 min
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