This document summarizes the history and evolution of internet-mediated climate change advocacy. It discusses how digital technologies have enabled more "armchair activism" by automating processes like donations and list-management. This lowered the costs of participation and made organizations less central. The document also examines three case studies of prominent climate advocacy groups (350.org, The Climate Reality Project, and The Guardian's "Keep it in the Ground" campaign) and how they have utilized digital tools. Finally, it considers tensions between targeting economic systems versus working within international agreements, as well as renewed activism against fossil fuel infrastructure projects.