Elizabeth Kolbert, Field Notes from a Catastrophe (London: Bloomsbury, 2006); Elizabeth Kolbert, The Sixth Extinction: An Unnatural History (London: Bloomsbury, 2014); Will Steffen et al., ‘Planetary Boundaries: Guiding Human Development on a Changing Planet’, Science 347:6223, 13 February 2015, DOI: 10.1126/science.1259855.
