A new global study reveals that ancient carbon, once thought securely stored in soils and rocks, is leaking into the atmosphere via rivers. For the first time, researchers have confirmed that carbon trapped in landscapes for thousands of years or longer can return to the atmosphere as carbon dioxide escaping from river surfaces. The study, led by scientists from the University of Bristol and featured as the cover story in Nature, suggests that plants and upper soil layers may be absorbing about one additional gigaton of CO2 annually to balance this release. This highlights an even more critical role for...