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Did the Earth once undergo a super ice age, one that froze the entire planet from the poles to the equator? In Snowball Earth, gifted writer Gabrielle Walker has crafted an intriguing global adventure story, following maverick scientist Paul Hoffman's quest to prove a theory so audacious and profound that it is shaking the world of earth sciences to its core. In lyrical prose that brings each remote and alluring locale vividly to life, Walker takes us on a thrilling natural history expedition to witness firsthand the supporting evidence Hoffman has pieced together. That evidence, he argues, shows that 700 million years ago the Earth did indeed freeze over completely, becoming a giant “snowball,” in the worst climatic catastrophe in history. Even more startling is his assertion that, instead of ending life on Earth, this global deep freeze was the trigger for the Cambrian Explosion, the hitherto unexplained moment in geological time when a glorious profusion of complex life forms first emerged from the primordial ooze. In a story full of intellectual intrigue, we follow the irascible but brilliant Hoffman and a supporting cast of intrepid geologists as they scour the planet, uncovering clue after surprising clue. We travel to a primeval lagoon at Shark Bay in western Australia, where dolphins cavort with swimmers every morning at seven and “living rocks” sprout out of the water like broccoli heads; to the desolate and forbidding ice fields of a tiny Arctic archipelago seven hundred miles north of Norway; to the surprising fossil beds that decorate Newfoundland's foggy and windswept coastline; and on to the superheated salt pans of California's Death Valley. Through the contours of these rich and varied landscapes Walker teaches us to read the traces of geological time with expert eyes, and we marvel at the stunning feats of resilience and renewal our remarkable planet is capable of. Snowball Earth is science writing at its most gripping and enlightening.

Life --- Paleoclimatology --- Snowball Earth (Geology). --- Origin.

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Paleoclimatology --- Climatic changes. --- Paléoclimatologie --- Climat --- Changements --- Climatic changes

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Paleolithic period --- Paleoclimatology --- Paleoecology --- Excavations (Archaeology) --- Paléolithique --- Paléoclimatologie --- Paléoécologie --- Sites archéologiques --- Cantabria (Spain) --- Antiquities.

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Climatic changes --- Archaeology --- Paleoclimatology --- Climat --- Archéologie --- Paléoclimatologie --- History --- Changements --- Histoire --- Africa, Sub-Saharan --- Afrique subsaharienne --- Antiquities. --- Antiquités --- Climate and civilization --- Archéologie --- Paléoclimatologie --- Antiquités --- Changes, Climatic --- Climate change --- Climate changes --- Climate variations --- Climatic change --- Climatic fluctuations --- Climatic variations --- Global climate changes --- Global climatic changes --- Climatology --- Climate change mitigation --- Teleconnections (Climatology) --- Civilization and climate --- Civilization --- Environmental aspects --- Changes in climate --- Climate change science --- History. --- Global environmental change

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This book provides a synthesis of the past decade of research into global changes that occurred in the earth system in the past. Focus is achieved by concentrating on those changes in the Earth's past environment that best inform our evaluation of current and future global changes and their consequences for human populations. The book stands as a ten year milestone in the operation of the Past Global Changes (PAGES) Project of the International Geosphere-Biosphere Programme (IGBP). It seeks to provide a quantitative understanding of the Earth’s environment in the geologically recent past and to define the envelope of natural environmental variability against which anthropogenic impacts on the Earth System may be assessed.

Paleoclimatology. --- Global environmental change. --- Paléoclimatologie --- Changement global (Environnement) --- Paléoclimatologie --- Atmospheric sciences. --- Geoecology. --- Environmental geology. --- Nature conservation. --- Geobiology. --- Paleontology . --- Air pollution. --- Atmospheric Sciences. --- Geoecology/Natural Processes. --- Nature Conservation. --- Biogeosciences. --- Paleontology. --- Atmospheric Protection/Air Quality Control/Air Pollution. --- Air --- Air contaminants --- Air pollutants --- Air pollution --- Air pollution control --- Air toxics --- Airborne pollutants --- Atmosphere --- Contaminants, Air --- Control of air pollution --- Pollutants, Air --- Toxics, Air --- Pollution --- Air quality --- Atmospheric deposition --- Fossilogy --- Fossilology --- Palaeontology --- Paleontology, Zoological --- Paleozoology --- Historical geology --- Zoology --- Fossils --- Prehistoric animals in motion pictures --- Biology --- Earth sciences --- Biosphere --- Conservation of nature --- Nature --- Nature protection --- Protection of nature --- Conservation of natural resources --- Applied ecology --- Conservation biology --- Endangered ecosystems --- Natural areas --- Geoecology --- Environmental protection --- Physical geology --- Atmospheric sciences --- Control --- Conservation