In “The Climate of History: Four Theses,” Dipesh Chakrabarty examined the idea of the Anthropocene—the dawn of a new geological period dominated by human activities—in the context of history and philosophy, raising fundamental questions about how we think historically in an era when human and geological timescales are colliding.This volume of RCC Perspectives offers critiques of these “Four Theses” by scholars of environmental history, political philosophy, religious studies, literary criticism, environmental planning, geography, law, biology, and geology.