This document summarizes a presentation about sustainable theming using Fusion Drupal themes. It discusses common unsustainable habits like assuming static content, striving for pixel perfection, and repeating styles. Quick fixes for sustainable theming are presented, including designing for abstraction, using a solid base theme, styling generally to create flexibility, and using the Fusion theme and Skinr module which allow non-developers to easily change styles without coding. Resources for learning more about Fusion theming are provided.