I study the invisible movements of carbon, nitrogen, and greenhouse gases through the air, forests, soils, rivers, and oceans—flows that connect ecosystems, people, and the climate. My work began in the Amazon, tracing carbon through trees, soil, and rivers, and expanded to regional and global scales to understand how human and natural processes drive greenhouse gas emissions. Using field studies, experiments, satellite data, and modeling, I track these complex flows to reveal their impact on the Earth’s climate. Understanding these hidden connections helps guide actions toward a more sustainable and resilient world.