This document provides information about the #hack4good hackathon event focused on addressing climate change challenges. It summarizes that the event involves over 33 cities around the world participating to create technology-based projects that address climate issues. It also outlines the judging criteria and process for projects to be considered in local and global competitions, with an emphasis on impact, foundations, portability, distribution, sustainability, and innovation. Local mentors are available to assist teams throughout the 72 hour hacking period.