Environmental Internet of Things systems and sensor networks have an exciting role to play in our measurement and understanding of the natural environment. Systems are just beginning to emerge from labs and be deployed in a wide range of earth sensing operations. The aim of this session is to look at problems and solutions encountered in both whole deployed systems and the components that they are built on. The focus is on the real world issues and designs needed to make sensor networks practical, from the sensors, through communications to the web issues. Each of these steps has its own challenges, as well as the overall problem of system integration. We aim to showcase working examples of fully integrated sensor networks from a range of environments (e.g. marine, glacial, fluvial, soils, volcanic, habitat), as well as smaller challenges or solutions encountered along the way.