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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).  Human activity has been driving   many other changes in the coupled "earth systems” of atmosphere, hydrosphere,   cryosphere, geosphere and biosphere in ways that could threaten, or at least strongly   stress, the so-called “project of civilization.”  These changes have   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).   diff --git a/layout.md b/layout.md  index 08e3431..bf716c5 100644  --- a/layout.md  +++ b/layout.md 
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Last remarks.tex  figures/Lcritical/Lcritical.png  figures/Drake4/Drake_Equation.jpg  Notes.tex