Billions of years ago, our planet looked very different, including its coloring. New research suggests that early oceans were ...

Earth’s oceans used to be green, and they could turn purple next By Jay Kakade April 27, 2025 What I think purple oceans might look like, generated with AI ...

Pale green dot The oceans were likely once a vibrant green color between 3.8 and 1.8 billion years ago, according to a study published in the journal Nature Ecology & Evolution.