Around two million years ago, when our early human ancestors shared the planet with saber-toothed tigers, mastodons, and giant rodents, Earth was a dramatically different place. It had plunged into a deep freeze, with multiple ice ages coming and goin… Read on blog or Reader ScienceBlog.com Read on blog or Reader Earth's Climate May Be Shaped by the Sun's Galactic Journey Boston University June 10 Around two million years ago, when our early human ancestors shared the planet with saber-toothed tigers, mastodons, and giant rodents, Earth was a dramatically different place. It had plunged into a deep freeze, with multiple ice ages coming and going until about 12,000 years ago. While scientists theorize that ice ages occur for various reasons, […] Continue reading

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