Zachary Berzolla is a PhD Candidate in Building Technology at MIT. He works with cities around the world to identify energy efficiency and renewable energy technology pathways to their GHG emissions reduction goals. To make this modeling accessible to any community, he has co-developed UBEM.io, a freely-available web tool that helps communities create 3D computer models from their geographic datasets and run the physics-based energy simulations that underly the technology pathways.