An example is the animation created by the NASA Scientific Visualization Studio, showing a world without oceans. They cover about 70 percent of the surface, so the change is really impressive.

Although the Earth’s been decidedly blue for 600 million years, rising populations of phytoplankton caused by rising temperatures are once again causing the world’s oceans to turn green.

A team of astrophysicists, geoscientists, chemists and life scientists affiliated with a host of institutions in Japan has found evidence that billions of years ago, the Earth's oceans were green.

To the Ends of the Earth: The Natural World - Oceans is available to stream on pbs.org and the free PBS App, available on iPhone, Apple TV, Android TV, Android smartphones, Amazon Fire TV ...

The scope of potential loss is staggering: The oceans are the world’s largest ecosystem, home to 80% of the planet’s biodiversity, and account for more than 97% of its water. They produce ...