(Image: Supplied)In this episode of Humans of Agriculture, Oli sits down with Sarah McDonald, Head of Sustainable Impact at Zentera (formerly New Zealand Merino) to unpack the reality behind sustainable wool.Sarah sits at the intersection of growers and global brands, her role is to translate what’s happening on farm into credible, measurable data that brands can trust and consumers can believe. From regenerative frameworks and biodiversity metrics to digital traceability and global legislation, this conversation explores how wool is being repositioned in a rapidly evolving sustainability landscape.Sarah unpacks the tensions between profitability and expectations, the challenge of comparing natural and synthetic fibres, and why clear communication across the value chain is more important than ever.This is a deep look into the systems, science and strategy shaping the future of wool.Key insights from the conversationWhy wool sits at the centre of a complex global system connecting growers brands and sustainability expectations across continentsWhat ZQ and ZQ+ actually measure on farm from biodiversity and soil health to credible market ready dataThe balancing act between farmers and brands navigating productivity and rising sustainability demandsWhy sustainability is really about risk driven by banks insurers and legislation more than consumersThe challenge of measuring impact in agriculture with seasonality and long timelines versus short term expectationsHow technology is transforming traceability by tracking wool from farm to garment using digital systemsNatural versus synthetic fibres and why emissions accounting can disadvantage woolChapters:00:00 Intro & episode overview02:15 Sarah’s role & measuring on-farm sustainability03:13 What Zentera (NZ Merino) does04:18 Bridging farmers and global brands05:07 Farm reality vs global expectations07:21 Sustainability timelines: short vs long term08:15 How sustainability is measured on farm09:35 Global pressure, risk & regulation12:16 Differences across NZ, AUS & South Africa13:53 The challenge of data collection15:17 Food vs fashion sustainability gap17:42 Tech, traceability & supply chains20:48 Natural vs synthetic fibres debate23:25 Careers in sustainability & Sarah’s journey29:51 Animal welfare, mulesing & industry pressure36:43 Outro & closing remarks