Earth in Human Hands Read online

  Copyright

  Copyright © 2016 by David Grinspoon

  Cover design by Flag

  Cover photograph by Günay Mutlu/Photographer’s Choice/Getty Images

  Cover copyright © 2016 by Hachette Book Group, Inc.

  Excerpt from “Once in a Lifetime”: words and music by David Byrne, Chris Frantz, Jerry Harrison, Tina Weymouth, and Brian Eno; copyright © 1980 WB Music Corp., Index Music, Inc., and E.G. Music Ltd. All rights on behalf of itself and Index Music, Inc. Administered by WB Music Corp. All rights reserved. Used by permission of Alfred Music. Excerpt from “Scatterlings of Africa” written by Johnny Clegg; copyright © 1982 Rhythm Safari Pty Ltd. Excerpt from “Crazy Fingers” copyright © 1975 Robert Hunter. Excerpt from “Eyes of the World” copyright © 1973 Robert Hunter. Excerpt from “Shipbuilding”: words and music by Elvis Costello and Clive Langer. © Copyright 1982 Universal Music Publishing MGB Limited. All Rights Reserved. International Copyright Secured. Used by permission of Music Sales Limited.

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  ISBN 978-1-4555-8913-5

  E3-20161018-JV-NF

  Contents

  Cover

  Title Page

  Copyright

  Dedication

  Epigraph

  Introduction

  1. Listening to the Planets

  2. Can a Planet Be Alive?

  3. Monkey with the World

  4. Planetary Changes of the Fourth Kind

  5. Terra Sapiens

  6. Intelligent Worlds in the Universe

  7. Finding Our Voice

  8. Embracing the Human Planet

  Photos

  Acknowledgments

  About the Author

  Also by David Grinspoon

  Art Credits

  Notes

  Newsletters

  For Jennifer, who always makes me feel that I am in good hands.

  With all the will in the world

  Diving for dear life

  When we could be diving for pearls.

  —Elvis Costello, “Shipbuilding”

  Introduction

  A Planetary Perspective on the Human Predicament

  Gazing over the countless fluctuations and transformations in Earth’s multibillion-year history, I am struck by the unique strangeness of the present moment. We suddenly find ourselves sort of running a planet—a role we never anticipated or sought—without knowing how it should be done. We’re at the controls, but we’re not in control. This book is my view of how we got into this situation, and where that leaves us now.

  A child of the space age, I grew up captivated by the romance of planetary exploration. My timing was right to become a NASA research scientist working in the new field of astrobiology, the scientific study of life in the universe. My participation in the spacecraft exploration of other planets has informed my view of our presence on this one. In these pages I’ll describe how we humans fit into the long-term story of Earth, and how I believe this knowledge can help us to navigate our current time of environmental stress and uncertainty about the future.

  Although climate change is the most obvious, it is only one of a large number of interconnected ways in which we have suddenly begun to modify the planet we inhabit. The scientific community is now converging on the idea that we have entered a new phase, or epoch, of Earth history—one in which the net activity of humans has become a powerful agent of geological change, equal to the other great forces of nature that build mountains and shape continents and species. The proposed name for this new epoch is the “Anthropocene” or the age of humanity. This concept challenges us to look at ourselves in the mirror of deep time, measured not just in decades or centuries or even in millennia, but over hundreds of millions and billions of years.

  The realization that humans may have initiated a new geological phase also disrupts and rearranges all our systems of timekeeping. Think of these three timescales: human history with its long procession of civilizations, migrations of people, and waves of technologies, ideas, and modes of thought; geologic time with its ages and epochs marking fluctuations in environment, climate, and sea level, recorded in the layers of rocks; and, closely related, biological time, the evolving stages and forms of life logged in the fossil and molecular records. The Anthropocene represents a braiding together of these into one inseparable narrative. This is “the end of history,” and of biology and geology—at least as separate stories. Have they become irreversibly entwined? It’s conceivable that there may never again be geological change without human influence.

  We are witnessing, and manifesting, something unprecedented and still completely unpredictable: the advent of self-aware geological change. As an astrobiologist, I study the possible evolutionary relationships between life and the planets that may host it. I see the Anthropocene as a tricky new step in the long, intricate dance between Earth and its biosphere that has been going on for four billion years. There are those who object to the name Anthropocene as being too self-aggrandizing and serving a destructive, human-centered viewpoint. But this epoch is well-named because it represents a recognizable turning point in geological history brought about by one species: anthropos. And our growing acknowledgment of this inflection can be a turning point in our ability to respond to the changes we’ve set in motion. I believe that, more than the extreme and undeniable physical changes to the planet being caused by human influence, it is this dawning self-recognition that is really fundamentally different and, ultimately, promising about the Anthropocene. Many species have changed the planet, to the benefit or detriment of others, but there has never before been a geological force aware of its own influence.

  Popular treatments of this rich subject have too often focused on the ongoing argument about whether or not the Anthropocene should officially be recognized as a new epoch within the geologic timescale, and at what point it began. Yet that debate has spurred a fascinating re-examination of the various stages of encroaching and accelerating human influence on Earth since the end of the last ice age twelve thousand years ago. And the Anthropocene has now garnered the attention of people thinking far afield of geologic timekeeping. The sharp human torqueing of Earth’s landscapes, habitats, and global cycles presents a range of challenges that go well beyond the physical and biological sciences.

  In 2012, I saw an announcement that opened up a door for me. The John W. Kluge Center at the Library of Congress, in partnership with the NASA Astrobiology Institute, was advertising a new position, a chair of astrobiology. They would support a scholar in residence to pursue “research at the intersection of the science of astr
obiology and its humanistic and societal implications.” I fantasized that this might give me the opportunity to write the book that you are now reading. My proposal was accepted and I was selected as the inaugural chair. I was psyched just to have some time to read and write, but I soon discovered how truly fortunate I was. The Kluge Center is a scholar’s dream: a supportive place to study, converse, and create, set within the ornate, infinitely stimulating palace of learning that is the Thomas Jefferson Building. I initially wondered if, as the only physical scientist there, I would be off playing in my own corner of the sandbox. I quickly learned that many of the humanists—historians, literary theorists, and theologians among them—were also keenly interested in exploring the changing relationship between humanity and the planet. My conversations with them1 were great fun, and I hope that some of the broadened perspective they provided has found its way onto these pages. Also among the joys of writing in Washington is the group of local scholars I’ve come to know, who are studying the Anthropocene from many different points of view. Our informal “Washington Anthropocene Group” started meeting at the Library of Congress, and has since migrated to several museums and universities, often continuing the conversation at local bars. I’m the only astrobiologist, but we’ve had geologists, historians, geographers, anthropologists, paleontologists, materials scientists, and others. At conferences and on the Web, I’ve met philosophers, ethicists, artists, and economists, all wrestling with the concept of humanity as a planet-changing force. Whatever its fate as an official geological time period, the concept of the Anthropocene has sparked a thousand worthwhile interdisciplinary conversations about the human role on Earth.

  I don’t believe in “great person” theories of science history. Ours is a team sport, a transpersonal endeavor. No individual is essential, and all worthwhile ideas will emerge eventually. But the story is also full of brilliant heroes and colorful characters who carve out the specific, somewhat random path science takes toward understanding. Without bombarding you with names, I do want to share some tales of a few of the people I’ve worked with or been influenced by. In looking over my manuscript, I notice that a disproportionate number of these people are men. Among other things, this reflects a tremendous loss to science, of potential contributions by those who have not been as welcome in our field. Of the five scientists I think of as my closest mentors, all are men. This is not unusual for a scientist who started out in my field in the 1980s. We are making progress, and it would be much more unusual for a scientist starting out today. Though the history of science is dominated by men, the future of science is not.

  One of the characters who winds his way through this book is astronomer Carl Sagan. My own personal connection with Sagan began when he and my father, a professor of psychiatry, bonded over the fact that, at one point, they were among the few Harvard faculty opposed to U.S. involvement in the Vietnam War. They became best friends and from the age of six I grew up around “Uncle Carl.” When I was a kid, his tales of space exploration and speculations on human evolution cast a powerful spell. In college I worked summers in his laboratory at Cornell, zapping mixtures of gas to simulate the organic goop on Saturn’s moon Titan and mathematically modeling potential alien signals. Later still, we worked together on a study of Earth’s early climate that became part of my doctoral dissertation.

  Carl also introduced me to Jim Pollack, who had been his first grad student at Harvard, and who decades later became my postdoctoral adviser at NASA’s Ames Research Center, where many of the scientific breakthroughs I describe in this book took place. In the 1970s, ’80s, and ’90s, Sagan, Pollack, and other planetary scientists modeled runaway greenhouses, asteroid strikes, and nuclear winters, along with the possible “terraforming” of Mars, Venus, and other worlds. Long before the current debate on whether or not we should consider “geoengineering” our planet, purposefully tweaking it to compensate for our clumsy climate modification, Sagan and Pollack were considering how humans might transform planets both accidentally and deliberately. The research these scientists did on planetary climate catastrophes informs my view of Earth’s history and the new kind of human-induced catastrophe it is now experiencing.

  It may seem circuitous to begin a book about the human role on Earth by talking about the exploration of other planets. I will try to make the case, however, that looking homeward from the vantages we’ve gained through our interplanetary journeys gives us valuable perspective for navigating the planetary-scale changes we are now facing—and causing. We need to learn all that we can about how planets work, so we can make the transition from inadvertently messing with Earth to thoughtfully, artfully, and constructively engaging with its great systems.

  The planetary perspective allows us to step away from the noise of the immediate present, to see ourselves from a distance, in time-lapse. When we do so, what we see is not just a problem facing our civilization but an entirely new evolutionary stage in the development of life. In seeing ourselves as a geological process, we also see the planet entering a phase where cognitive processes are becoming a major agent of global change. Earth’s biosphere gave birth to these thought processes, which are now in turn feeding back and reshaping its changing planetary cycles. A planet with brains? Fancy that. Not only brains, but limbs with which to manipulate and build tools. We are just beginning to come to grips with this strange new development. Like an infant staring at its hands, we are becoming aware of our powers but have not yet gained control over them.

  It’s a challenging moment for human civilization. The great restless cleverness of our species has gotten us into a tough spot. Our collective actions, over which we often seemingly have little control, threaten the well-being of many of our fellow humans, not to mention vast numbers of our more distant biological relatives. Our very survival may be threatened. Paradoxically this comes at a time, and even largely as a result, of unparalleled advancement in our scientific and technological prowess. But if we’re so great at figuring things out and inventing solutions to survival problems, how come we’re in this mess? Part of the reason we are, so far, stumbling through this transition is that we have not yet seen it clearly for what it is. I think our fundamental Anthropocene dilemma is that we have achieved global impact but have no mechanisms for global self-control. So, to the (debatable) extent that we are like some kind of global organism, we are still a pretty clumsy one, crashing around with little situational awareness, operating on a scale larger than our perceptions or motor skills. However, we can also see our civilization, such as it is, becoming knitted together by trade, by satellite, by travel, and instantaneous communications, into some kind of new global whole—one that is as yet conflicted and incoherent, but which is arguably just beginning to perceive and act in its own self-interest.

  We have, unconsciously, been making a new planet. Our challenge now is to awaken to this role and grow into it, becoming conscious shapers of our world. We have to “human up” and accept the responsibility we’ve stumbled into. We didn’t ask for this. And we may not be up for the challenge, but at this point we have no choice. However we got here, we find ourselves dominating many of our world’s systems and needing to learn, under duress, how to handle that. It’s a complex task, and we have to learn how to do it without a manual and on the fly. Fortunately, we may have a leg up. There are some ways in which our evolutionary history and our unique plasticity as a species may equip us for the job.

  Some of the most amazing things are very easy to take for granted. How cool is it that I am writing this and you are reading it? By thwacking away at these dirty little plastic keys in some coded pattern, I’m sending you a detailed message over malleable expanses of space and time. What is this magic? Our fingers were not evolved for this. They were made for grasping and throwing, touching and feeling, making tools, making dinner, making love. And yet here we are. These human hands and the nervous systems they are wired to are so flexible, seemingly made to be rewired as needed. Time and time again our species has e
scaped existential threats by reinventing ourselves, outsmarting the toolkit evolution gave us, finding new skills not coded in our genes to survive new challenges not previously encountered by our forbearers. We’ve bounced back a few times from the edge of extinction, and ultimately thrived due to our abilities to communicate, work collectively, adapt creatively to changing environments, and solve problems through technological and social innovation.

  Now we need to do so again. To do the Anthropocene right, we’ll have to use our innate skills at cooperative problem-solving and innovative tool use to become more effective global actors. We would so like to avoid this reality, this responsibility, but having seen what we’ve seen, and what we’ve done, we can’t go back to being ordinary members of the animal kingdom. We also can’t afford to ignore natural constraints, or imagine we are so clever we can just invent our way right past them.

  I think we’re junior apprentice planetary engineers. We can’t shrink from this role and to do it well will require finding a much deeper understanding of both our world and ourselves. We have, without knowing it, thoroughly reworked our planet. Now that we are realizing this, what should we do? We cannot un-rework it. So we need to rework ourselves into the kind of creatures who can successfully play the role we’ve unwittingly assumed.

  It sometimes seems to rub people the wrong way to say anything sympathetic about humanity, positive about our potential influence on Earth or hopeful about our future. How could you not be shocked and alarmed by our jarring, accelerating influence on this planet? We rightfully feel some deep regret, and some shame, at how we have (not) managed ourselves.

  However, our obligation now is to move beyond just lamenting the job we’ve done as reluctant, incompetent planet-shapers. We have to face the fact that we’ve become a planetary force, and figure out how to be a better one. By seeing our role clearly, we take the first step toward assuming our responsibilities. We need to pause and look up at the distant horizon to see where we really are. A planetary view of the human journey, where we take in the wider timescape, suggests that we are not stuck, just disoriented, not evil, just confused, struggling to find our way in a world increasingly of our own making, and confronting aspects of our existence for which we are not yet fully equipped. We’ve been building an expanding, rapidly changing civilization on a finite world with no long-term plan. Our challenge is to acknowledge, with clear eyes, the tough predicament we’re in, and not to succumb to toxic fatalism. Our most valuable resources—creativity, communication, invention, and reinvention—are in fact unlimited.