Allbirds has pledged to be sourcing nothing but “regenerative” wool by 2025. The U.S. direct-to-consumer brand plans by that same year to have made its supply carbon-neutral as well. Rather than change suppliers, Allbirds will be encouraging a technique called regenerative agriculture, which – as defined by the non-profit organization Regeneration International – can “reverse climate change by rebuilding soil organic matter and restoring degraded soil biodiversity,” while enabling “carbon drawdown” from the atmosphere and “improving the water cycle.” Merino wool accounts for about a quarter of the brand’s raw materials and about four-fifths of its emissions.