If a reader were to flip open the book at a random place, I hope they would encounter one of the eccentric scientists pursuing their research with a singular focus no matter what chaos stirred around them. A reader would gain a quick understanding of the book’s major themes by reading the four-page prologue. A reader could also start any of the four sections of the book—famine, plague, war, and ecology—to see if the book’s style is attractive to their tastes. The epilogue is best read last, because it tells a personal story that relates to the broad historical sweep of the book.A reader most interested in the origins of the environmental movement would especially like chapters 10 (Resistance), 11 (Silent Spring), and 12 (Wonder and Humility). These chapters examine environmentalism through the personal struggles and beautiful writings of Rachel Carson. These chapters also reveal how the environmental movement is rooted in democracy and repulsed by corporate and governmental violations of the public trust. Rachel Carson’s Silent Spring motivated citizen engagement in protests against pollution, the enactment of environmental laws, and the organization of scientists to stop the environmental destruction of the Vietnam War. Corporate malfeasance and governmental neglect continued, but no longer against the backdrop of an uninformed and uninvolved citizenry.“The problem that I dealt with in Silent Spring,” Carson said, “is not an isolated one. It is merely one part of a sorry whole—the reckless pollution of our living world with harmful and dangerous substances.” It is my hope that The Chemical Age furthers Carson’s goal to educate people about the pollution of our world. The book does this by exposing the lofty ambitions of scientists to rid the world of hunger and disease, and by examining how chemicals designed for public health were appropriated for the battlefield (and vice-versa). For in the end, history is much more complex than battles between good and evil, and good people trying to solve intractable problems often create even bigger problems in the process.The Chemical Age ultimately tells a story both about humanity’s courage in the face of adversity and moral decay during times of great evil. Through chemistry, we have fundamentally altered our world. We have forced famine and infectious diseases to retreat, thereby vastly improving our ability to live fulfilling lives. We have increased the lethality of war to such an extent that we are now capable of destroying all humanity, rather than just the neighboring village. We have so thoroughly altered the chemical makeup of the environment that biodiversity is in a state of free-fall and we will forever live in a world degraded of its natural diversity.But a deep understanding of this history also gives us the means to improve our trajectory—to keep famine and disease at bay while avoiding war and cleaning up the environment. Humanity sits at a tipping point, poised for a future when either the destruction in the 20th century will be viewed as the beginning of a long slide into misery or the end of a period of hubris that future generations will find hard to comprehend.