Although the Earth’s been decidedly blue for 600 million years, rising populations of phytoplankton caused by rising ...

Earth's oceans may have been green for billions of years until the first photosynthetic organisms flooded our atmosphere with oxygen.

The ocean can be many colors, but for the most part it's deep blue. But why? And what's up with green or brown or red water?

However, the ocean and its accompanying blue economy are actively being threatened by climate change, and problems will only worsen without proper government efforts. The ocean may also be key to ...