Marine systems cover more than 70% of the Earth’s surface, play a major role regulating climate and biogeochemical cycles, and provide a variety of ecosystem services to humans. Whether they are lakes, rivers, coastal waters, or the open ocean, these systems are all facing increasing pressures from climate change and human activities with consequences for water quality, biogeochemical cycling, and ecosystem functioning and suitability. Our team at the Center for Remote Sensing uses optics and remote sensing to promote a better quantitative understanding of aquatic processes and of their climate- and human-driven perturbations. Projects typically involve a combination of field observations, laboratory-based experimental work, remote sensing information and modeling, and span a wide range of scales from regional lakes to continental-scale coastal systems and global oceans.