300 million years ago, dog-sized scorpions and millipedes walked the earth and tropical rainforests towered into the sky. George R. McGhee Jr. explores that ancient world, explaining its origins, its downfall in the end-Permian mass extinction, and its legacies, to offer insight into past and present extinction events and climate change.

300 million years ago, dog-sized scorpions and millipedes walked the earth and tropical rainforests towered into the sky. George R. McGhee Jr. explores that ancient world, explaining its origins, its downfall in the end-Permian mass extinction, and its legacies, to offer insight into past and present extinction events and climate change.