The age of humans may soon be known as the age of nuclear. For two decades, scientists have debated whether we are living in a new geological epoch. They appear to have decided that we are and that the invention of nuclear energy should mark its beginning. Twenty-nine of the 34 members of the Anthropocene Working Group (AWG) voted this week to declare the invention and testing of nuclear weapons as the beginning of the Anthropocene or geological age of humans. The two other main contenders for demarcating the start of the epoch were the rise of agriculture, which radically altered landscapes, and the birth of the industrial revolution, which has accelerated climate change. The 1945 explosion of nuclear weapons at Hiroshima and Nagasaki, and the radioactive fallout from outdoor nuclear weapons testing, which continued until 1963, is physically embedded in glacial ice and earth sedimentation. Advocates for the invention of nuclear as the best way to mark the beginning of the human age note that, unlike anything done by hunter-gatherers, agriculturalists, or industrialists, nuclear …