Brezinski DK, et al. (2009) Palaeogeography, Palaeoclimatology, Palaeoecology 284, 315.

Burgess SD, Bowring S and Zhong Shen S (2014) Proceedings of the National Academy of Sciences USA 111, 3316.

Canfield DE, Glazer AN and Falkowski PG (2010) Science 330, 192.

Cleland CE and Copley SD (2006) International Journal of Astrobiology 4, 165.

Corcoran PL, Moore CJ and Jazvac K (2014) GSA Today, 24, 4–8.

Cozar A, et al. (2014) Proceedings of the National Academy of Sciences USA 111, 10239.

Cristini L, et al. (2012) Palaeogeography, Palaeoclimatology, Palaeoecology 339–341, 66.

Crutzen PJ (2002) Nature 415, 23.

Denovan BA and Strand SE (1992) Chemosphere 24, 935.

Diaz RJ and Rosenberg R (2008) Science 321, 926.

D’Onofrio R, et al. (2016) Paleoceanography 31, 1225.

Drake FD (1961) Discussion at Space Science Board-National Academy of Sciences Conference on Extraterrestrial Intelligent Life, Green Bank, West Virginia, USA.

Drake FD (1965) In Mamikunian G and Briggs MH eds. Current Aspects of Exobiology. Pergamon, Oxford, pp. 323–345.

Dressing CD and Charbonneau D (2013) The Astrophysical Journal 767, 95.

Eide M, et al. (2017) Global Biogeochemical Cycles 31, 492–514.

Erba E, Bartolini A and Larson RL (2004) Geology 32, 149.

Eriksen M, et al. (2014) PLoS ONE 9, e111913.

Frank A and Sullivan WT (2016) Astrobiology 16, 359.

Galazzo FB, et al. (2014) Paleoceanography 29, 1143.

Gałuszka A, Migaszewski ZM and Zalasiewicz J (2013) Geological Society, London, Special Publications 395, 221.