700 million years ago, Earth was a giant snowball cloaked inice from pole to pole – a global deep freeze that held theplanet in a stranglehold, threatening the survival of theearliest complex life. How did life manage to hold on in thisforbidding world? Leading scientists investigate how thiscatastrophe may have become a catalyst for life to evolve increative new ways as it bounced back from the brink – settingthe stage for the astonishing complexity we see today.
