Back to today’s briefing

Story perspectives

Ancient Oceans Were Vibrant Green, Not Blue

3/28/2025

35 5

Summary

Story summary

Earth's primordial oceans, dating back over 4.5 billion years, were likely a vibrant green, not the blue we see today. These ancient waters, teeming with hydrothermal vents spewing ferrous iron, set the stage for life to emerge 800 million years later, reshaping our understanding of the planet's early history.

1 of 1

Story summary

Earth's primordial oceans, dating back over 4.5 billion years, were likely a vibrant green, not the blue we see today. These ancient waters, teeming with hydrothermal vents spewing ferrous iron, set the stage for life to emerge 800 million years later, reshaping our understanding of the planet's early history.