Riley Black

Winner, A Friend of Darwin Award, 2024 A gorgeously composed narrative nonfiction book about the longstanding relationship between prehistoric plants and life on Earth. Immaculately framed by ancient stone, the leaves look as if they were pressed between the gray pages of a great geological diary. If we were to see the plant alive, we would simply pass it by, but the fossil is a whisper from a time more than 55 million years ago, when alligators dwelled within the Arctic Circle and gigantic dragonflies buzzed through the air. This little plant is an entry-point into this lost world. Past, present, and future, this ancient specimen has roots in all of them. We often retell the history of life on Earth as a series of great moments in which fascinating animal life springs forth, all the while forgetting the plants that made these moments possible. But we can’t understand our own history without them. Or, our future. Dinosaurs, saber-toothed cats, and all mammals would be nothing without the efforts of their leafy counterparts. Even humans would likely not exist had plants not taken root to sow the land for our amphibious ancestors. Using the same scientifically-informed narrative technique that readers loved in the award-winning The Last Days of the Dinosaurs, in When the Earth Was Green, Riley Black brings readers back in time to prehistoric seas, swamps, forests, and savannas where critical moments in plant evolution unfolded. Each chapter stars plants and animals alike, underscoring how the interactions between species have helped shape the world we call home. As the chapters move upwards in time, Black guides readers along the burgeoning trunk of the Tree of Life, stopping to appreciate branches of an evolutionary story that links the world we know with one we can only just perceive now through the silent stone, from ancient roots to the present.

Winner of the AAAS/Subaru Prize for Excellence in Science Books! "This is top-drawer science writing." ―Publishers Weekly, starred review In The Last Days of the Dinosaurs, Riley Black walks readers through what happened in the days, the years, the centuries, and the million years after the impact, tracking the sweeping disruptions that overtook this one spot, and imagining what might have been happening elsewhere on the globe. Life’s losses were sharp and deeply-felt, but the hope carried by the beings that survived sets the stage for the world as we know it now. Picture yourself in the Cretaceous period. It’s a sunny afternoon in the Hell Creek of ancient Montana 66 million years ago. A Triceratops horridus ambles along the edge of the forest. In a matter of hours, everything here will be wiped away. Lush verdure will be replaced with fire. Tyrannosaurus rex will be toppled from their throne, along with every other species of non-avian dinosaur no matter their size, diet, or disposition. They just don’t know it yet. The cause of this disaster was identified decades ago. An asteroid some seven miles across slammed into the Earth, leaving a geologic wound over 50 miles in diameter. In the terrible mass extinction that followed, more than half of known species vanished seemingly overnight. But this worst single day in the history of life on Earth was as critical for us as it was for the dinosaurs, as it allowed for evolutionary opportunities that were closed for the previous 100 million years. "This is pop science that reads like a fantasy novel, but backed up by hard facts and the latest fossil discoveries. Black is pioneering a new narrative prehistorical nonfiction." ― Steve Brusatte, New York Times bestselling author of The Rise and Fall of the Dinosaurs