I am excited to announce our new project funded by the National Science Foundation’s Discovery Research K-12 program (DRL 1720838 and 1719872). In the High School Students’ Climate Literacy through Epistemology of Scientific Modeling (CliMES) project, we will engage in a 4-year, mixed-methods, design-based research project to investigate classroom use of EzGCM (Easy Global Climate Modeling), a web-based climate modeling suite designed to provide non-scientists experiences with climate modeling. We are developing and implementing a 6-week climate science module for secondary science classrooms designed around EzGCM. Each year, we will collect and analyze evidence of students’ model-based reasoning about climate, including pre-/post- measures of students’ conceptual and epistemic knowledge, curriculum-embedded modeling tasks, interviews, and videorecorded observations of instruction to investigate two research questions: 1) how do secondary students develop epistemic and conceptual knowledge about the Earth’s climate and climate science? and 2) how do secondary science teachers support students’ use of EzGCM to develop epistemic and conceptual knowledge about the Earth’s climate and climate science? The project will impact over 50 secondary teachers and 3000 secondary students over four years and leverages a new partnership between Columbia University and the University of Nebraska-Lincoln, promoting cross-fertilization between climate scientists and science educators, in partnership with Nebraska school districts.