For thinking about the future of life on Earth in planetary terms, no one can 
match the perspective of an astrobiologist.

David Grinspoon notes two major shifts in Earth’s biological regime: 1) 2.1 
billion years ago, when cyanobacteria flipped the whole planet from anaerobic 
to oxygen-based life; 2) now, as humans assume domination of the Earth’s living 
systems. “We suddenly find ourselves running a planet,” he says, “without 
knowing how it should be done. We’re at the controls, but we’re not in 
control.”  The cyanobacteria were unaware of their role.  We are aware of ours. 
 What should we do about that?

Grinspoon is professor of Astrophysical and Planetary Science at the University 
of Colorado and Senior Scientist at the Planetary Science Institute. His books 
include: Earth in Human Hands: Shaping Our Planet’s Future (02016); Lonely 
Planets (02004); and Venus Revealed (01998).

"Earth in Human Hands," David Grinspoon, SFJAZZ Center, Hayes Valley, San 
Francisco, 7pm, Wednesday, September 6.  The show starts promptly at 7:30pm.

To be sure of a seat:
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on the Grinspoon Seminar page to reserve 2 free seats 
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• Seminar at SFJAZZ Center <> 201 
Franklin Street, San Francisco, CA 94102
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Share this talk: David Grinspoon, "Earth in Human Hands" Long Now talk on 9/6 <>

Talks coming up:
Oct 30 (Mon.) - Renee Wegrzyn, Engineering Gene Safety 
Nov 20 (Mon.) - Elena Bennett, Seeds of a Good Anthropocene 
Dec 12 & 13 (Tue. & Wed.) - Rick Prelinger, Lost Landscapes of San Francisco, 12

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