My favorite lead is a paper by Angela Hessler "Earth's Earliest Climate" which I'm trying to summarize - but days are crowded and surprises may lay in wait, making it impossible to write for a while and it's been so long since my last installment I at least want to share the gold nugget I found in her paper, the following graph.
It's a wonderful collection of our planet's geophysical vital signs. Okay, I'm not positive it's the "most" beautiful graph on Earth, beauty is in the eye of the beholder - but I am sure it's a fantastic window into the physical reality of our Earth and how the pageant of time has created the biosphere we humans take oh so for granted. Hope to be back soon.
Currently director of the Deep Time Institute
red line = O2
(The reign of humanity would fit within tiniest vertical sliver at the far right end of this graph)
Lead Editor: Figen Mekik