Other than encounters with colourful coral reefs while snorkelling in places like the Red Sea in Egypt, you may wonder what ...

While plants and some bacteria can make their own food ... too few tritons on the reef, crown-of-thorns starfish populations can explode, jeopardizing the living coral that makes up reefs.

from plankton and coral up the food chain to sea stars, salmon, sea otters, whales — and ultimately people, who rely on oceans for food. The oceans have become 30 percent more acidic because of the ...