Earth has witnessed five cataclysmic mass extinction events that forever reshaped life on the planet. Now, a sixth extinction is unfolding-one driven not by asteroids or supervolcanoes, but by human activity. In The Sixth Extinction, Aurora Wynter presents a comprehensive and urgent exploration of both past and present die-offs, weaving together insights from paleontology, climate science, and ecology. This meticulously researched book examines the fossil record of ancient extinctions, the natural forces that once reset life on Earth, and the alarming parallels to today's biodiversity crisis. It traces the impact of habitat destruction, pollution, overexploitation, invasive species, and climate change-revealing how human actions are accelerating species loss at an unprecedented rate. Readers will explore case studies of critically endangered species, the cascading consequences of ecosystem collapse, and the role of global cooperation and innovative technologies in halting this crisis. Wynter also offers a hopeful vision, outlining actionable strategies to protect the planet's remaining biodiversity and foster resilience. The Sixth Extinction is a vital wake-up call for anyone concerned about the future of life on Earth and a compelling guide for those determined to make a difference.