Scientists are worried because they can’t fully explain the big jump, but they think it might mean that carbon absorption by forests, fields and wetlands is slowing down—a major problem for the world.

In his California laboratory, Ralph Keeling examines a graph created from data his father began collecting that keeps a ...

To study Mars’s chemical and mineral makeup, the Curiosity rover drills one to 1.5 inches down into the subsurface, then ...