Our research focuses on how terrestrial ecosystems respond to various global change drivers such as rising CO2, nutrient pollution, human land use, and extreme weather events, and how these ecosystem responses, in turn, influence the trajectory of global change. Our work spans from tropical rainforests to the tundra and encompasses scales from physiology to ecosystems. The influence of symbiotic nitrogen-fixing plants on ecosystem dynamics, the belowground responses of trees to elevated CO2, and the processes that drive soil carbon storage are particular foci of our work. We combine field and greenhouse experimental manipulations, large-scale observational studies, and global data analyses to illuminate the web of interactions between human activity, terrestrial ecosystem processes, and global change.