Three-quarters of our planet are covered by oceans, so what happens in those oceans can have a profound effect on the rest of the planet.
We've learned this lesson--often the hard way--in recent years, as the oceans warm with the rest of the Earth, and the acid levels in the water rise.
It's getting hard for some creatures, like coral, to survive.
Abel Valdivia is an ocean scientist at the Center for Biological Diversity.
He speaks at the Redding library Thursday night (Oct. 29), and joins us on the air for a preview of the many issues he sees on and below the surface.