WASHINGTON, United States (AFP) — The Alaskan tundra appears to be emitting more carbon dioxide than it captures, a dynamic that could accelerate climate warming as vast stores of CO2 trapped in Arctic soils are unlocked by rising temperatures. A question scientists have had is whether a warming climate would lead to a greater intake of CO2 through photosynthesis during the summer growing season. But a study published Monday in the Proceedings of the National […]