In the early 1980’s, I chaired a group of scientists exploring the idea of a comprehensive satellite mission to study all aspects of the global environment. The group was diverse with expertise covering the range of Earth science disciplines from geology, ecology, oceanography, limnology, glaciology, and atmospheric science and their various sub-disciplines. Their first recommendation was take today’s data today. In all of Earth science there is the recognition that we have only one Earth to study. How Earth works is revealed by watching it change in a comprehensive manner and ...