A of Earth's Big Five mass extinctions, the past worlds lost with each, and what they all can tell us about our not-too-distant future. Was it really an asteroid that killed the dinosaurs? Or carbon dioxide-driven climate change? In fact, scientists now suspect that climate change played a major role not only in the end of the age of dinosaurs, but also in each of the five most deadly mass extinctions in the history of the planet. Struck by the implications...