Climate Central: Scientists may have resolved a long-standing puzzle in climate science by showing that ancient increases in atmospheric carbon dioxide came at the same time as rising temperatures, rather than hundreds of years afterward.
In a new analysis of bubbles trapped in Antarctic ice, published Thursday in Science, lead author Frederic Parrenin of the Laboratory of Glaciology and Geophysics of the Environment, in Grenoble, France, and his colleagues write that at the end of the last ice age, about 20,000...