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Welcome to this Special Issue of the Journal of Geoscience Education, dedicated to discussing Earth system science education: its present state and future directions. Due to the diversity and complexity of Earth system processes, scientists and educators commonly are required to comprehend and apply knowledge of the atmosphere, biosphere, geosphere, hydrosphere, and anthroposphere in their research and in the classroom. The exciting and integrative aspects of Earth system science enter with the recognition that none of these spheres occurs in isolation; instead, they interact to produce the Earth system, in a grand "symphony of the spheres."
The symphony metaphor can be used to describe the concordant physical, biological, chemical and social processes that define conditions on our planet. Just as each instrument in a symphony works in concert with the others to make polyphonic music, so to do elements of air, water, land and fife act and interact to create the Earth system that operates in harmony on a planetary scale. Whether symphony or planet Earth, the ensemble of interrelated states ana processes produces a complexly woven music that collectively makes the group far more interesting and dynamic than any of the parts.
Of course the metaphor has limitations, and there are important differences between a symphony and the Earth system, including issues of direction (e.g., lack of a score in the Earth system), scale and complexity. A student of the symphony has a fundamentally finite task when listening and examining the musical score to extract a theme, a melody or a variation. A student of music can even experiment with the score to examine the effect of individual instruments or sections on the final symphonic performance. The student of the Earth system, however, has a much more daunting task. The nearly infinite combined effects of a myriad of complex processes defy simple analysis, and direct, controlled experiments upon the system as a whole are impossible. Yet, careful observation of the Earth system coupled with an understanding of physical, chemical and biological principles has given rise to complex models of air, water, land and life processes that can be used to predict the state, process and evolution of the system overall. Indeed, the study of Earth system science can be considered exploration in itself...