Under a Green Sky

Under a Green Sky examines mass extinction events throughout Earth's history and their potential relevance to current climate change. Ward, a paleontologist, presents research from field work and scientific studies to reconstruct past environmental catastrophes. The book follows Ward's investigations of geological evidence across multiple continents, focusing on the chemical and atmospheric conditions that preceded ancient die-offs. His research points to a specific mechanism involving ocean chemistry and atmospheric changes that may have triggered several past extinction events. Through a synthesis of paleontology, geology, and atmospheric science, Ward draws connections between prehistoric extinctions and modern climate trends. The narrative alternates between scenes of scientific fieldwork and technical explanations of Earth's systems. The work raises questions about humanity's impact on global systems and the cyclical nature of Earth's most devastating events. By examining multiple extinction episodes as case studies, the book presents an empirical framework for understanding long-term planetary changes.

Readers found Ward's scientific explanations clear and appreciate how he connects past extinction events to current climate change. Many note the book helps them understand complex paleontological concepts through vivid descriptions and accessible writing. Specific praise focuses on Ward's field research stories and his explanation of hydrogen sulfide's role in extinctions. Multiple readers highlighted the "purple ocean" scenario as memorable and concerning. Common critiques mention: - Repetitive writing style - Too much personal narrative/field stories - Limited solutions offered for current climate issues - Technical terms not always well defined Ratings: Goodreads: 3.9/5 (447 ratings) Amazon: 4.2/5 (58 ratings) "The science is fascinating but gets lost in meandering stories" - Goodreads reviewer "Important message buried in unnecessary detail" - Amazon reviewer "Changed how I think about extinction events" - LibraryThing reviewer

The Sixth Extinction by Elizabeth Kolbert This investigation of past and present mass extinctions connects human activity to Earth's previous catastrophic events through scientific evidence and field research.

Our Final Hour by Martin Rees The text examines extinction-level threats to human civilization through the lens of astronomy and Earth science.

The Ends of the World by Peter Brannen A geological exploration of Earth's past mass extinctions reveals patterns and mechanisms that shaped planetary life and death.

The Long Thaw by David Archer The book tracks carbon dioxide's role in Earth's climate shifts through deep time and its implications for future planetary changes.

When Life Nearly Died by Michael J. Benton An examination of the Permian extinction demonstrates how ancient climate catastrophes transformed Earth's ecosystems.

🌎 Peter Ward spent over a decade studying the geological evidence of mass extinctions, discovering that most were caused not by asteroid impacts, but by rapid climate change and ocean chemistry shifts. 🦕 The book explores the controversial "Medea Hypothesis," which suggests that life on Earth is ultimately self-destructive, contrasting with the more optimistic Gaia hypothesis. 🌡️ The "green sky" referenced in the title describes a possible future scenario where hydrogen sulfide gas turns the sky a sickly shade of green - a condition that may have occurred during past extinction events. 🌊 During the end-Permian extinction (covered extensively in the book), about 95% of marine species and 70% of terrestrial vertebrate species went extinct - the largest mass extinction in Earth's history. 📚 Ward wrote this book after a near-death experience while conducting research in Western Australia, where he almost succumbed to heat exhaustion - an event that made him deeply contemplate Earth's potential future under extreme climate change.