Rivers and streams play a surprising role in the global carbon cycle, releasing greenhouse gases into the atmosphere at significant rates. But how exactly do these waterways "breathe," and what drives this exchange? This short film follows an international team of scientists on a journey through the mountains of Italy and France as they measure gas exchange in fast-flowing alpine streams. Blending science with stunning landscapes and real-world challenges, the video offers a rare, behind-the-scenes look at the people, places, and purpose behind cutting-edge climate research.