Building for sustainability with WordPress – Susty WP:

Hat tip to Tom Woodward

This website aims to act as a guide to making WordPress websites more sustainable, and to serve as a practical example of how we can tune our websites and reduce their carbon footprint. The homepage of this website is delivered to your browser with just 6KB of data transfer. This is achieved by its theme, plugins and configuration. As of 2016, the average website data transfer was 2.3MB, making it 393 times bigger than this website!