Why 12 Million Tons of Glass Goes to Landfills Every Year (And How We're Stopping It)
Wed Jan 21 2026
Every year, 12 million tons of architectural glass from skyscrapers and office buildings ends up in landfills. Even though you diligently put your glass bottles in the recycling bin, only 30% of collected glass actually gets recycled back into glass.
Sydney Mainster, VP of Sustainability at The Durst Organization, is on a mission to change that. After watching hundreds of tons of perfectly recyclable glass from a 40-story building go to waste, she pioneered a partnership to recycle skyscraper windows across New York City.
In this episode, Sydney and David Entwistle (Director of Major Projects at Saint-Gobain Glass) reveal:
- Why glass is the ONLY material recyclers lose money on
- The hidden contamination problem that shuts down $40M furnaces
- How "sneaky sustainability" is making glass recycling standard practice
- Why interior office glass is the secret to scaling this solution
- The roadblocks preventing this from going national
Sydney and David are completely reimagining how we handle one of our most valuable building materials.
🔗 Connect with Sydney Mainster: https://www.linkedin.com/in/smainster/🔗 Connect with David Entwistle: https://www.linkedin.com/in/david-entwistle-b51b2531/
Chapters
00:00 Circular Economy in Glass Recycling00:37 Roles and Responsibilities in Sustainability00:54 The Glass Recycling Challenge07:37 Understanding Architectural Glass vs. Container Glass16:15 Origin Stories of Glass Recycling Programs27:03 Collaboration and Learning in the Industry31:30 The Journey of Deconstruction and Sustainability33:37 Overcoming the Status Quo in Construction35:12 Convincing Stakeholders for Sustainable Practices38:40 The Role of Case Studies in Advocacy40:19 Scaling Challenges in Sustainability43:46 Looking Forward: The Future of Sustainability
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Every year, 12 million tons of architectural glass from skyscrapers and office buildings ends up in landfills. Even though you diligently put your glass bottles in the recycling bin, only 30% of collected glass actually gets recycled back into glass. Sydney Mainster, VP of Sustainability at The Durst Organization, is on a mission to change that. After watching hundreds of tons of perfectly recyclable glass from a 40-story building go to waste, she pioneered a partnership to recycle skyscraper windows across New York City. In this episode, Sydney and David Entwistle (Director of Major Projects at Saint-Gobain Glass) reveal: - Why glass is the ONLY material recyclers lose money on - The hidden contamination problem that shuts down $40M furnaces - How "sneaky sustainability" is making glass recycling standard practice - Why interior office glass is the secret to scaling this solution - The roadblocks preventing this from going national Sydney and David are completely reimagining how we handle one of our most valuable building materials. 🔗 Connect with Sydney Mainster: https://www.linkedin.com/in/smainster/🔗 Connect with David Entwistle: https://www.linkedin.com/in/david-entwistle-b51b2531/ Chapters 00:00 Circular Economy in Glass Recycling00:37 Roles and Responsibilities in Sustainability00:54 The Glass Recycling Challenge07:37 Understanding Architectural Glass vs. Container Glass16:15 Origin Stories of Glass Recycling Programs27:03 Collaboration and Learning in the Industry31:30 The Journey of Deconstruction and Sustainability33:37 Overcoming the Status Quo in Construction35:12 Convincing Stakeholders for Sustainable Practices38:40 The Role of Case Studies in Advocacy40:19 Scaling Challenges in Sustainability43:46 Looking Forward: The Future of Sustainability