The Earth System Science Education Alliance (ESSEA) is a successful teacher professional development program enhancing K-12 teachers' environmental literacy and ability to teach Earth System Science. The ESSEA 40+ educational institution consortium is supporting universities and other educational institutions in teacher preparation and professional development for pre-service and in-service K-12 teachers. This NOAA-funded project enhances and builds on this foundation by: 1) Using the ESSEA online courses as a model to introduce newly upgraded Earth system science undergraduate and graduate courses for teachers; 2) Introducing new Earth System Science data, analysis tools and educational resources to support the teacher courses; and 3) Disseminating model teaching practices and program success through annual conferences, continuing support, and presentations at geoscience and education conferences.