средства защиты при работе в электроустановках 2015
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средства защиты при работе в электроустановках 2015, Carbon record reveals evidence of extensive human fire use , Ancient Humans Were Using Fire to Shape the Earth 50,000 , Onset of extensive human fire use 50,000 y ago | PNAS, Onset of extensive human fire use 50,000 y ago - PubMed, Scientists discover evidence of extensive human fire use , New study uncovers 50,000-year legacy of man-made fires, Record of polycyclic aromatic hydrocarbons (PAHs) from .
Just a moment...Please complete security verificationEnable JavaScript and cookies to continueThis request seems a bit unusual, so we need to confirm that you're human. Please press and hold the button until it turns completely green. Thank you for your cooperation!Press and HoldPress and hold the buttonIf you believe this is an error, please contact our .64.71.32.88 : 264f2e4e-8e49-46a0-b39b-d86676df, Carbon record reveals evidence of extensive human fire use 50,000 years ago by Li Yali, Chinese Academy of Sciences edited by Lisa Lock, reviewed by Robert Egan Editors' notes, In other words, the ancient fires lit by migrating humans may have had consequences far beyond the immediate warmth they offered—they may have begun to change the Earth’s carbon cycle itself. A Global Pattern in the Smoke This isn’t the first time scientists have noticed a surge in ancient fire activity..
By integrating pyrogenic carbon records with archaeological data, we propose that intensified human global expansion, population growth, and rising demand for fire use during cold glacials resulted in a surge in fire use since approximately 50,000 y ago., Fire is a pivotal aspect of human involvement in the carbon cycle. However, the precise timing of the large-scale human fire use remains uncertain. Here, we report a pyrogenic carbon record of East Asian fire history over the past 300,000 y from the East China Sea. This record suggests a rapid incre …, This study, published in the Proceedings of the National Academy of Sciences (PNAS), highlights the presence of charred plant remains — known as pyrogenic carbon — formed when vegetation burns but is not completely consumed by fire. The research reveals a notable increase in fire activity across East Asia approximately 50,000 years ago., (CN) — Researchers from the Institute of Oceanology at the Chinese Academy of Sciences have uncovered compelling evidence of a sharp increase in human-driven fires beginning approximately 50,000 years ago. The findings provide groundbreaking insights into the evolution of human behavior and its growing impact on our planet. The team analyzed pyrogenic carbon, fire-derived chemicals, found in , This study aims to integrate molecular biomarkers of polycyclic aromatic hydrocarbons (PAHs) with sedimentary records of charcoal and black carbon to evaluate and determine the role of human, .