'Bomb carbon' in wood shavings helped researchers measure the stability of biochar in soil‎

Biochar can store carbon in the soil and reduce the amount of carbon dioxide in the atmosphere—yet we still know too little about how long the biochar will persist. Now, researchers from the Swedish University of Agricultural Sciences have found a new way to measure this, using wood from the 1960s that was affected by nuclear weapons testing. The paper is published in the journal Radiocarbon.