Contents

       COVER

       TITLE PAGE

      COPYRIGHT

       DEDICATION

      PROLOGUE

      SILENCE

      MOVEMENT I—EARTH: Carbon, the Element of Crystals

       Prelude—Before Earth

       Exposition—Earth Emerges and Evolves

       Development—Deep Earth Carbon

       Recapitulation—Carbon Worlds

       Coda—Unanswered Questions

      MOVEMENT II—AIR: Carbon, the Element of Cycles

       Introduction—Before Air

       Arioso—The Origin of Earth’s Atmosphere

       Intermezzo—The Deep Carbon Cycle

       Arioso, da Capo—Atmospheric Change

       Coda—The Known, the Unknown, and the Unknowable

      MOVEMENT III—FIRE: Carbon, the Element of Stuff

       Introduction—Material World

       Scherzo—Useful Stuff

       Trio—Nano Stuff

       Scherzo, da Capo—Stories

       Coda—Music

      MOVEMENT IV—WATER: Carbon, the Element of Life

       Introduction—The Primeval Earth

       Exposition—Origins of Life

       Development—Life Evolving (Theme and Variations)

       Recapitulation—The Human Carbon Cycle

       Finale—Earth, Air, Fire, and Water

      PICTURE SECTION

      NOTES

      INDEX

      ACKNOWLEDGMENTS

      ABOUT THE AUTHOR

      ABOUT THE BOOK

      ALSO BY ROBER T M. HAZEN

       ABOUT THE PUBLISHER

       Prologue

      LOOK AROUND YOU. Carbon is everywhere: in the paper of this book, the ink on its pages, and the glue that binds it; in the soles and leather of your shoes, the synthetic fibers and colorful dyes of your clothes, and the Teflon zippers and Velcro strips that fasten them; in every bite of food you eat, in beer and booze, in fizzy water and sparkling wine; in the carpets on your floors, the paint on your walls, and the tiles on your ceilings; in fuels from natural gas to gasoline to candle wax; in sturdy wood and polished marble; in every adhesive and every lubricant; in the lead of pencils and the diamond of rings; in aspirin and nicotine, codeine and caffeine, and every other drug you’ve ever taken; in every plastic, from grocery bags to bicycle helmets, cheap furniture to designer sunglasses. From your first baby clothes to your silk-lined coffin, carbon atoms surround you.

      Carbon is the giver of life: Your skin and hair, blood and bone, muscle and sinews all depend on carbon. Every cell in your body—indeed, every part of every cell—relies on a sturdy backbone of carbon. The carbon of a mother’s milk becomes the carbon of her child’s beating heart. Carbon is the chemical essence of your lover’s eyes, hands, lips, and brain. When you breathe, you exhale carbon; when you kiss, carbon atoms embrace.

      It would be easier for you to list everything you touch that lacks carbon—aluminum cans in your fridge, silicon microchips in your iPhone, gold fillings in your teeth, other oddities—than to enumerate even 10 percent of the carbon-bearing objects in your life. We live on a carbon planet and we are carbon life.

      Every chemical element is special, but some elements are more special than others. Of all the periodic table’s richly varied denizens, the sixth element is unique in its impact on our lives. Carbon is not simply the static element of “stuff.” Carbon provides the most critical chemical link across the vastness of space and time—the key to understanding cosmic evolution. Over the course of almost 14 billion years, the Universe has evolved and become ever more richly patterned, with seemingly endless fascinating and quirky behaviors. Carbon lies at the heart of this evolution—choreographing the emergence of planets, life, and us. And, more than any other ingredient, carbon has facilitated the rapid emergence of new technologies, from steam engines of the Industrial Revolution to our modern “Plastic Age,” even as it accelerates unprecedented changes in environment and climate on a planetary scale.

      Why focus on carbon? Hydrogen is a far more abundant chemical element, helium more stable, and oxygen more reactive. Iron, sulfur, phosphorus, sodium, calcium, nitrogen—all have fascinating stories to tell. All played critical roles in Earth’s complex evolution. But if you wish to find meaning and purpose in the vast cold and dark of the Universe, look to carbon; carbon, by itself and in chemical combinations with other atoms, provides unmatched cosmic novelty and unparalleled potential for cosmic evolution.

      Of more than 100 chemical elements, carbon stands out as an element of our aspirations and fears. Novel carbon-based