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\textbf{NOTES}  Lineweaver & Chopra 2012  Seager 2013  3.5-Gyr-old biosphere  Astrobiology is essentially the study of life in an astronomical context (Sullivan & Baross   2007)  Anthropogenic global climate change is currently recognized as a significant, perhaps   fundamental, issue facing human civilization (Solomon et al 2007). 
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been dramatic enough for some researchers to begin speaking of the beginning of the   Anthropocene, a new, geological epoch succeeding the Holocene (the current interglacial   period; Zalasiewicz et al 2010).