“…For documented past examples, see for China: Zhang et al (2007), for Easter Island: Bahn and Flenley (1992), but also more general considerations: Ehrlich (1968), Hardin (1968), Meadows et al (1972Meadows et al ( , 1992Meadows et al ( , 2004, Tainter (1988Tainter ( , 1995Tainter ( , 1996, Ehrlich and Ehrlich (2013), Diamond (1997Diamond ( , 2005, Leslie (1998), Ash (2002), Haraldsson and Sverdrup (2004), Tilly (2003Tilly ( , 2007, Klein (2007), Lövin (2007), Greer (2008), Sachs (2008), Brown (2009b), Rockström et al (2009), Fukuyama (2011. We conclude that lack of resources is a potentially dangerous situation globally.…”