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CURRENT SCIENCE, VOL. 115, NO. 10, 25 NOVEMBER 2018 1871 Ricardo A. Correia, Ana C. M. Malhado and Richard J. Ladle are in the Institute of Biological and Health Sciences, Federal University of Alagoas, Praça Afrânio Jorge, s/n, Prado, Maceió, AL, Brazil; Ricardo A. Correia and Richard J. Ladle are also in the School of Geography and the Environment, University of Oxford, Oxford OX1 3QY, United Kingdom; Zeynep C. H. Correia is in the Department of Urban and Environmental Sciences, Ankara University, Cemal Gürsel Cad., Cebeci, Ankara, Turkey and Department of Political Science and Public Administration, Kırıkkale University, Yenişehir Mh. 71450, Kırıkkale, Turkey. *For correspondence. (e-mail: [email protected]) Pivotal 20th century contributions to the development of the Anthropocene concept: overview and implications