図1 (IMAGE) Kobe University Caption 図1.大気中の二酸化炭素 (CO2) における14C濃度(Δ14C)の経時変化 Credit 神戸大学 Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.