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See Ancient Earth from Space
The Americas 65 million years ago just before the extinction of dinosaurs after an impact in the Yucatan Peninsula (center). Our planet was warmer and had many more forests and almost no ice caps during the end of the Cretaceous Period.
University of Puerto Rico at Arecibo
Over the past 750 million years, our blue marble has gone through remarkable changes; continents have shifted, ice ages have come and gone, sea levels have risen and fallen, and one-time deserts have turned green, allowing creatures to crawl out of the oceans and live off the land.
From MSNBC
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