In 21st century learning, students are required to master 21st century themes, one of which is environmental literacy. This research aims to analyze the increase in students' environmental literacy using Socio-Scientific Issues based e-modules. The research method used was pre-experimental with a quantitative approach. The sampling technique uses purposive sampling where the class used is class X-2. The research data shows that the increase in environmental literacy for class Based on the data from this research, the use of e-modules based on Socio-Scientific Issues can increase students' environmental literacy in environmental change material.