Are we now living in the Anthropocene

Jan Zalasiewicz^a, Mark Williams^a, Alan Smith^b, Tiffany L. Barry^c, Angela L. Coe^c, Paul R. Bown^d, Patrick Brenchley^e, David Cantrill^f, Andrew Gale^g, Philip Gibbard^h, F. John Gregoryⁱ, Mark W. Hounslow^j, Andrew C. Kerr^k, Paul Pearson^k, Robert Knox^l, John Powell^l, Colin Waters^l, John Marshall^m, Michael Oatesⁿ, Peter Rawson^o, and Philip Stone^p

a Department of Geology, University of Leicester, Leicester LE1 7RH, UK
b Department of Earth Sciences, University of Cambridge, Cambridge CB2 3EQ, UK
c Department of Earth Sciences, The Open University, Walton Hall, Milton Keynes MK7 6AA, UK
d Department of Earth Sciences, University College London, Gower Street, London, WC1E 6BT, UK
e Department of Earth Sciences, University of Liverpool, Liverpool L69 3BX, UK
f Royal Botanic Gardens, Birdwood Avenue, South Yarra, Melbourne, Victoria, Australia
g School of Earth and Environmental Sciences, University of Portsmouth, Portsmouth, Hampshire PO1 3QL, UK, and Department of Palaeontology, Natural History Museum, London SW7 5BD, UK
h Department of Geography, University of Cambridge, Downing Place, Cambridge CB2 3EN, UK
i Petro-Strat Ltd, 33 Royston Road, St. Albans, Herts AL1 5NF, UK, and Department of Palaeontology, Natural History Museum, London SW7 5BD, UK
j Centre for Environmental Magnetism and Palaeomagnetism, Geography Department, Lancaster University, Lancaster LA1 4YB, UK
k School of Earth, Ocean and Planetary Sciences, Cardiff University, Main Building, Park Place, Cardiff CF10 3YE, UK
l British Geological Survey, Keyworth, Nottinghamshire NG12 5GG, UK
m National Oceanography Centre, University of Southampton, University Road, Southampton SO14 3ZH, UK
n BG Group plc, 100 Thames Valley Park Drive, Reading RG6 1PT, UK
o Scarborough Centre for Environmental and Marine Sciences, University of Hull, Scarborough Campus, Filey Road, Scarborough YO11 3AZ, UK, and Department of Earth Sciences, University College London, Gower Street, London WC1E 6BT, UK
p British Geological Survey, Murchison House, Edinburgh EH9 3LA, UK