Deep, ancient soils, dating to between 15,000 and 13,500 years old, contain significant amounts of carbon and could contribute to climate change as the carbon is released through agriculture, mining and other human activities, according to a group of scientists headed by Dr Erika Marin-Spiotta from the University of Wisconsin-Madison. An eroding bluff on the U.S. Great Plains reveals a buried, carbon-rich layer of fossil soil. Image credit: Jospeh...
