Earth: From Green Marble to Blue Planet – A Tale of Transformation

But then came a revolution: The Great Oxidation Event, roughly 2.4 billion years ago. Oxygen-producing microbes changed everything. Oxygen levels soared, altering chemistry, wiping out some life forms, and paving the way for oceans to turn blue with dissolved iron.

The blue oceans marked a shift—life diversified, and Earth’s atmosphere began its long transformation into something breathable. This marked the end of the green era, a bittersweet farewell to Earth's first lush identity.

Today, we look up to our blue skies and oceans, but beneath them lies a vivid reminder of Earth’s past—a Green Marble etched into the rocks, waiting to tell its story. Is it far-fetched to think the planet might shift colors again someday?

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