This document summarizes a professional development program called Teaching Climate Change that will offer two online courses for K-12 teachers through PBS and NASA. The goals are to strengthen teachers' understanding of climate science, enable them to teach about climate change using STEM strategies and NASA resources, and foster interdisciplinary approaches. A research study will evaluate the courses' impact on teachers' knowledge, awareness of NASA materials, and classroom practices. Over 200 teachers will participate across control and experimental groups.