Radioactive carbon from nuclear bomb tests detected at the bottom of the ocean

"There is a very strong interaction between the surface and the bottom, in terms of biological systems, and human activities can affect the biosystems even up to 11,000 meters. We must therefore pay attention to our future behaviors, "said Weidong Sun, a geochemist at the Chinese Academy of Science in Qingdao, China, and co-author of the study, in the statement. "This is not expected, but it is understandable because it is controlled by the food chain."