In this episode of Environment Variables, host Chris Adams dives into the evolving landscape of sustainable web development with Alexander Dawson and Tzviya Siegman from the World Wide Web Consortium (W3C). Dawson and Siegman discuss the W3C’s efforts to develop Web Sustainability Guidelines (WSG), a comprehensive set of evidence-based practices aimed at reducing the environmental impact of web technologies. They explore the creation and potential impact of these guidelines, especially as global interest grows in embedding sustainable practices within web standards. The episode also covers the challenges of driving adoption across public and private sectors, the role of testability in sustainability guidelines, and future directions for standards that minimize digital carbon footprints. This engaging conversation provides listeners with insights into how W3C’s sustainability initiatives could shape the future of the web.