Project Earthsense is a k-12 environmental education program developed in response to the need to address math and science education reform. The overall goal of the program is to provide a context centered around the study of our environment for developing critical thinking and problem solving skills following a constructivist philosophy. Project Earthsense has its heritage in the ground Truth Studies(GTS) activities developed by the Aspen Global Change Institute. Building on the GTS program, teacher training workshops were expanded to place additional emphasis on learning concepts and scientific process. Two areas of science and technology from the basis of Project Earthsense, remote sensing and hydrology, which provide a more comprehensive, balanced approach to Environmental Education. A constructivist model of learning allows for meaningful learning of the subject matter, use of critical thinking skills, and development of an understanding of the nature of science. Teacher training workshops rely on both lecture and hands-on activities at the local university campus, botanical gardens and nearby State park. We believe the environment is a socially relevant and meaningful medium for learning earth science, physics, chemistry, biology and mathematics. In the long run, this effort will create citizens with a capacity and disposition to learn an dbetter understanding of environmental change. As a consequence, they will be better stewards of Earth as a more knowledgeable electorate with respect to environmental issues and policies.